What Effect Do Contraceptive Pills Have on a Pregnancy Test?

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The first thing you need to do if you believe you are pregnant but are on a birth control pill like Mircette is to stop taking it. Then you need to take a home pregnancy test to make sure you are not damaging a fetus. Some people wonder whether accuracy of home pregnancy test are affected when you have been taking the pill and the quick answer is no!

Your birth control pill has a combination of progestin and estrogen hormones but home pregnancy tests do not look at those hormones when testing for pregnancy. Therefore you can feel quite confident in the results you get. So whether you have been taking the pill until very recently or did so in the past it has no affect on a home pregnancy test. The concern is the safety of the possible baby.

It is unlikely that you are pregnant if you have been taking your pill as you should. Mircette for example is very effective unless there have been some days that you missed taking it. Remember that if you stopped taking any oral contraception for whatever reason and then you resume using it again, you should use back up contraception like condoms for a week.

Though estrogen does rise in a pregnancy, home tests look for a hormone called hCG or human chorionic gonadotropin. This is produced by the placenta when a fertilized egg implants itself into the lining of the uterus. After a few days post implantation levels of hCG become detectable in the blood and urine and a home test looks for that. Most home tests are best to use a week after a missed period or 10 -16 days after conception for those that had been on birth control pills. Sometimes though because this method of contraception can cause irregular ovulation you may need to do a couple of pregnancy tests to be sure of the results.


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