Pregnant?

My boyfriend and I have never had unprotected sex, and the condom has never broke, however, we had (protected) sex on the day I ovulated and maybe 5 days later I had some spotting (however, I always bleed after sex and this was the morning after we had had sex again). A few days later I started feeling nauseous (although I did have quite a bit to drink the night before) and my discharge is wet, but there is not an increase in amount. My period is supposed to come in 3 days. All of my "symptoms" are either implantation or PMS, and I'm very anxious that there is a possibility I could be pregnant. What do you guys think?