Last Saturday I had sex with a boy and it was my first time. We were drinking so I was tipsy and so was he so we decided to stupidly have sex without a condom, and I am also not on any form of contraceptive. He thinks he may have pre *** inside of me but it may have been a small amount of ejaculation but he doesn't know. The next day I went to a chemist and got the emergency contraceptive (morning after pill); a 1.5mg levonorgestrel which I took around 15 hours after having sex. My period was due yesterday (Thursday) and the pharmacist said because I was long past ovulation it was unlikely to be pregnant but to take it anyway to be sure. It's Friday now and I haven't gotten my period but I'm also on antibiotics and painkillers for tonsillitis so could this affect my period? Could I be pregnant or will my period come soon? I'm really scared as I'm 16 and couldn't face being pregnant. Can someone please inform me if I have a chance of pregnancy? Thanks.