Girls, girls, girls... Lol.. Unprotected sex leads to pregnancy, if you don't want to be pregnant, use protection, especially at 15. I know I sound just like your parents. Lol.. I have a daughter, she is only 5, but I have already been thinking about our birds and the bees talk :d lol. Well, I just wanna be sure she is protected, im not going to say sex is wrong dont do it.. Cuz chances are, she'll do it. But anyway, yes chances are, you are pregnant especially if you are 2 weeks late.. You do have to tell your parents obviously, they will be upset at first, but hopefully they will understand that there is nothing you can do now, and will except the baby.. And yes, I would take a pregnancy test asap. And as for the first post, I got pregnant the last day of my menstral cycle, your most fertal time is right after your period I believe. Like the first 1-2 after. I hope you girls are ok, and everything goes great for you !!! Good luck when confronting your family etc... Sandi