I am on the Yaz pill and have been for 4 months. A week ago, i had sex with my boyfriend. The next morning i took my pill at my usual time (7 am) but then i was sick from something i ate, and vomited. I wasnt sure if i had vomited up the pill or not. So i took another pill at 6pm that night and then started taking my pill again as usual at 7am the next morning. My period was due yesterday, and it did come. But im still not convinced that i wont be pregnant. Could i be?