I am on the pill and have been for years. I try to take it everyday but sometimes i forget it. In the past two months, i have missed it twice, once each month, i missed it for 3 days last month and doubled up, but during those three days i had unprotected sex once. I ended up with a uti and was given antibiotics which i took and had unprotected sex a week before my period while i was on antibiotics but someone told me they lessen my birth control. Is this true? My period came that month and lasted from thursday to friday. Very light no more than a panty liner but it was red. This month i missed the pill for two days, doubled up and had a period from thursday to saturday. Should i assume that since i had a period that everything is fine and i’m not pregnant? The only thing different was before my period started i was feeling nauseous the days up to it but other than, it was a normal period. Not heavy, but not light. Advice?