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missed a few pills this month and was on antibiotics?

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I was wondering if I could be pregnant, because I am on birth control and have been since I was 13 and my periods are always around the same time. This month however I have went through the inactive pills and I'm on the fourth active pill and haven't had a full period. I had brownish spotting and saw a dab of pink blood on the last day of the inactive pills but now nothing and I'm worried. My fiance and I only use birth control as a contraceptive. I also missed a few pills this month and had to back up and take them, and I was on antibiotics for a few days and forgot to use back up. I took a pregnancy test yesterday and it was negative.

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replied November 28th, 2011
Am I Pregnant Answer A28965
Welcome to ehealthforum,
If you had been sexually active without additional/back-up protection after missing active pills (and while being on antibiotics), the chances of pregnancy cannot be ruled out completely. Antibiotics are known to affect the efficacy of the birth control pills. Missing 2 or more than 2 active pills or taking them 2-3 hours later than scheduled time for more than 2 occasions can also put you at risk for pregnancy. The lighter/altered and delayed bleeding/spotting could be suggestive of possibility of pregnancy. If pregnancy is suspected, look out for development of any new symptoms suggestive of pregnancy and consider visiting your gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Sometimes urine pregnancy tests can keep showing you false negative results during early pregnancy as the kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. Stop the birth control use if you suspect chances of pregnancy or if pregnancy gets confirmed.
Take care.

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