Okay. So I just had a baby almost 3 months ago. I've been on birth control for a month and a half and I've had my period already. 2 nights ago my husband and I had sex and he came in me. Then yesterday I was put on penicillin bc I got strep. I was reading online and it said that the antibiotic affects my birth control and use back up methods for the next couple weeks which I'm okay with. But then also sperm can live inside you for 6 days. So I'm wondering if I could get pregnant from the other night if my meds are messing with my birth control. Plus since I'm like really fertile from just having a baby.