I started taking antibiotics after my period last month I continued my Birth Control and continued to have sex. I have not gotten my period this month i am 3 weeks late. I have taken two tests both negative. Could i still be pregnent?

We aer used to hearing that

We aer used to hearing that antibiotics, including commonly prescribed ones like penicillin and ampicillin, have the potential to interfere with the effectiveness of birth control pills.

Here's the good news - the only antibiotic that has been shown to decrease effectiveness of the pill in studies is rifampin. Luckily, rifampin isn't commonly prescribed in the US. It is primarily used to treat tuberculosis. Anytime you are prescribed an antiobiotic, feel free to discuss your concerns with your doctor. If it's been a couple of weeks of steadily taking the pill and it's not the first month you are on it, then call your prescribing doc - bloodwork may be in order.


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