My fiance and I just had sex for the first time. I've been on birth control for 2 weeks now, however, I have had some diarrhea in the past week. Not for the past 3 days, though. I'm wondering if the pill is still effective, though, considering that. I also had some spotting/ maybe a period (that was 2 weeks early) that ended yesterday and had been going on for 5 days. Basically, I'm wondering what is the chance that I'll get pregnant from my first time?