I was taking birth control very irregularly, but no sex. However, one night I had a VERY brief and VERY drunk encounter and I'm pretty sure he was too drunk and it lasted a few seconds, don't remember if he came honestly. Anyhow I took about three pills the next day, finished the pack normally and then stopped entirely. I got my period for a couple days and that was mid April... I haven't had my period since, so 4 months. I took a pregnany test a month ago and it was negative, but I'm getting chubby, and making me crazy thinking I'm pregnant. Could I be pregnant,how can I tell without another test?