Contraceptives

Will Taking Contraceptive Pills make a Pregnancy Test Inaccurate?

If you suspect that you may be pregnant and you are taking a contraceptive pill like Mircette, it is wise to stop taking your pills until you have at least carried out a home pregnancy test - this will ensure that there are no risks to the fetus. You may be wondering though, if a home pregnancy kit works by measuring hormone levels- and you have been taking synthetic hormones in your Mircette contraceptive pill - “Will I get an accurate result from my DIY test?

Pregnancy tests do not measure estrogen and progestin, the two hormones in combined oral contraceptive pills so even if you get pregnant while taking an oral contraceptive, you can rely on the result of the test being accurate. Taking Mircette will NOT interfere with your pregnancy test result.This is true whether you are still taking Mircette or have recently stopped taking it because of your suspicion that you may be pregnant.

Mircette is an extremely effective oral contraceptive pill so it is highly unlikely that you will become pregnant while taking it, unless you have missed several days of taking your pill. If you have stopped taking Mircette or any other brand of oral contraceptive pill, now is the time to decide if you wish to become pregnant now or sometime in the near future. If you do not wish to get pregnant at this point in your life, you should resume taking the pills and use back up contraception for a week.

But don’t estrogen levels rise when you are pregnant and oral contraceptives, like Mircette, contain estrogen?

Yes, when you are pregnant estrogen levels are higher but this is NOT the hormone that is measured by a pregnancy test kit. All pregnancy test kits measure beta HCG (a placental hormone called human chorionic gonadotropin).  A urine or a blood sample can be used to measure beta HCG.

Most home urine pregnancy tests will turn positive  10 - 16 days after conception occurs. If you were not taking oral contraceptives, this would be around the time of your first missed period. When you are on oral contraceptives, ovulation could have occurred at a more irregular time so that if the pregnancy test is negative, you are either not pregnant OR you are less than 14 days pregnant from the date you ovulated.

If you were to become pregnant while taking oral contraceptives, a normal ‘withdrawal bleed’ would not occur.

Source:  Dr. Rick Jelovsek MD.

WHEN contraceptives actually work in your body could make all the difference as to how you feel about selecting one- especially where religious tolerances are concerned and ‘abortion’ in the purest sense of the word is a real issue for you.

We use contraceptives mainly to ensure that we don’t get pregnant. “Getting pregnant” means that his sperm has fertilized your egg and a baby is on the way right? Well, that all depends on WHEN you believe a new life has begun. Is it at fertilization or a bit later- before, during or after the fertilized egg has implanted itself into the wall of your uterus?

Selecting a method of contraception may be more confusing and stressful for you if your religion has certain beliefs around when a new human life begins. Seek counseling and accurate information on this issue so that you can be satisfied that the type of contraceptive you eventually choose does not conflict with what you personally believe. I acknowledge that if you are against abortion you may also be against methods of birth control that are not ‘natural’. I list options below for information only.

Family planning professor, John Guillebaud has examined many sources of information on contraceptives and WHEN they work regarding fertilization and implantation and, as this site aims to address all aspects of contraceptives, I thought it wouldn’t hurt to summarise some of his study findings to help those of you who face this dilemma. Professor Guillebaud’s personal view is that implantation is the biological event that separates family planning from abortion. If you are unsure about the physiological changes that oral contraceptives cause within the uterus itself, I strongly recommend that you also read the whole of this post- it may just help you make the final decision.

Let’s look at WHEN Oral Contraceptive Pills Work

The active ingredients in the combined oral contraceptive pill prevent ovulation and therefore prevent fertilization so there is nothing to implant. For this reason they are not classed as ‘abortifacients’. Their capacity to activate their ‘back up mechanism’, that of obstructing implantation of a fertilized egg, is what puts oral contraceptives into the ‘gray’ area of the purist abortion debate.

The progestin only pill sometimes acts after fertilization (with the exception of Cerazette) because in some women it permits ovulation to happen therefore an egg could be fertilized. However, if taken correctly and on time, it is scientifically proved that these pills also act prior to fertilization and do not have to ‘use their back up mechanism’ to block implantation.

Obviously if you regularly forget to take your combined oral contraceptive pill, (particularly a low dose one) you risk ovulating.

It is the lengthening of the pill free period that causes pill failure pregnancies and ‘near misses’- NOT forgetting to take a pill at other times. Even if ovulation does occur without subsequent pregnancy, it does not follow that the pill acts post-fertilization: the hormones in the oral contraceptive thicken the cervical mucus and block the sperm’s journey to the egg.

Professor Guillebaud states “Most experts believe that if sufficient pills were missed to cause the mucus mechanism to fail as well, there still wouldn’t be any interference beyond fertilisation; the anti-implantation effect (being the COCP’s weakest contraceptive effect) would fail also, leading to conception. Of course, one couldn’t be certain of this over many years of forgetful pill-taking. Still, we are talking about a forgetful pill-taker taking one of the weakest available pills.”

Depo-Provera

This type of contraceptive prevents ovulation and is delivered by an injection given ‘on time’ every 3 months. If you are worried about possible fertilization happening (and implantation subsequently being disrupted) you can opt to have the injection every 10 weeks instead of every 12 weeks. This will ensure that ovulation is always blocked and (for you) the unacceptable back-up mechanism is never used.

Please note: According to Alison Edelman, M.D., an assistant professor of obstetrics and gynecology at Oregon Health Sciences University, in Portland, Depo can delay fertility for up to a year and a half (the average is six months) With the other hormonal methods, including the Pill, it’s possible to become pregnant within one to three months.Intrauterine contraceptive devices (IUCs or IUDs)

IUDs contain copper or Levonorgestrel. Copper is toxic to sperm. Devices containing Levonorgestrel act as contraceptives by thickening cervical mucus to block sperm from traveling to the egg. Both types also keep the uterus lining thinner than normal to make implantation difficult. Using this type of contraceptive, which also acts after fertilization, could be a dilemma for you if you believe that life begins at fertilization, not at implantation.

If you believe that blocking implantation is abortion and you are also a hopeless pill taker, here is a list of contraceptive options that you may wish to consider:

• Male and female sterilization- vasectomy, tubal ligation or Essure insertion

• a combined oral contraceptive pill such as Mircette or Ortho Tricyclen (but do not lengthen the pill free period)

• shorten the pill free period of your combined oral contraceptive pill to 4 days instead of 7 and/or use a tri cycle regime-in which the pill free interval is eliminated usually for four, three or sometimes two monophasic pill cycles (for better bleeding control) and then also shortened after each run of packets.

Implanon prevents ovulation and is a contraceptive device that is inserted underneath the skin on the inside of a woman’s upper arm. The hormone content and actions are very similar to Cerazette. Implanon should be replaced every three years. Implanon acts prior to fertilisation and does not have to ‘use the mechanism’ to block implantation.

Full breast-feeding - combined with the ‘mini pill (progestin only) or the Depo-Provera injections. During weaning there is a risk of ovulation so back up contraceptives should be used.

Coitus interruptus- also known as ‘withdrawal’ or ‘being careful’, is better than using no manufactured contraceptive but is not the most effective method of birth control. Even those little sperm in that first drop of fluid swim very fast into the uterus and are up into the Fallopian tubes before you know it!

Natural fertility management- charting your temperature and checking the thickness of your cervical mucus helps you to estimate your ‘infertile days’ when there is little risk of pregnancy.

Male and female barrier methods and spermicides- including condoms, the diaphragm and the cervical cap.

The home pregnancy test kit

This kit measures a hormone in a woman’s blood called hCG (human chorionic gonadotrophin) If hCG is present the test shows a positive reading BUT hCG only shows up AFTER IMPLANTATION (which occurs six to twelve days after fertilization) of the fertilized egg into the wall of the uterus. hCG (nor any other embryo-specific substance) does not show up while contraceptives are in use. This means that any method of contraception linked with the presence of serum hCG would be off-limits to someone requiring a contraceptive that only operates BEFORE fertilization.

Source: www.cmf.org.uk

Oral contraceptives and risks-  alarming headlines can often be misleading when it comes to oral
contraceptive research so it pays not to assume anything on first ’skimming’. Rather, investigate a bit more deeply if it’s something that is likely to affect you and your body and your own future management of contraception.  A whisper about ‘new’ evidence on oral contraceptives, either positive or negative,  can generate mass over reaction and exaggeration.  Find out for yourself as much as you can before allowing the results of studies and ‘findings from the latest research’ influence any decision you are about to make about a specific contraceptive you are considering.

One of the agreed benefits of taking combined oral contraceptives that emerged from many global studies over the years,  is that they reduce the risk of ovarian cancer.  It now seems that they may also slightly reduce the risk of colon cancer .  According to lead researcher Dr. Geoffrey C. Kabat, of Albert Einstein College of Medicine in New York it’s too soon to leap ahead and conclude this yet but in a study of nearly 90,000 Canadian women aged 40- 59, it was found that those who had ever used contraceptive pills were 17 percent less likely to develop colon cancer over the next 16 years.  Interestingly, this was NOT the case for women on HRT (hormone replacement therapy)

These results regarding oral contraceptives were published in the International Journal of Cancer after a breast cancer screening study was carried out on 89,835 Canadian women over a period of 16 years. Studies with smaller groups have also been done in Italy between 1985 and 1996 with similar results.

It seems to me that there are so many other factors to be considered such as lifestyle, weight, medical history of family for colon cancer and not least the various doses of hormones in all the different types of oral contraceptives,  so I think it will be quite a while before any firm statement will be made on this one.

There is not much choice when it comes to short videos about ‘guys bits’ and how they work but I found this one that is pretty clear.

There is also a short video on female reproductive organs on this site too so please check out the Reproductive organs category  or the Videos  in the sidebar.