About two weeks ago (on the first week of my new pack of birth control, sprintec) I had a stomach bug and vomited and had diarrhea. Fortunately my doctor told me to try to take another pill after being ill that morning after taking it. I was able to keep the second pill down for almost three hours. I then waited 8 days before having unprotected sex. However, this past weekend I was a little hungover and threw up about three hours after taking this pill. I plan on waiting 8 days again and I am also skipping my period for the month. I just want to know what would be the chances of getting in pregnant after vomiting? I'm also 21 and have been with my boyfriend for over two years so I don't want to hear about condom usage, we are both std free. :) also have been on sprintec for about two years without ever missing a pill. Thanks.