Last Wednesday the 22nd I had sex for the first time.. and it wasn't planned so we had no protection. I don't know if he came but I took plan b the next day just in case. My period was supposed to come the day after we had sex, but now its ten days late. After some research I learned that it is a possible side affect of the pill but I'm still worried. I'm considering buying a test but I don't know if I should wait some more time. Please give me any advice you could think of?