My period is 8 days late. Last time I had sex was May 14th and it was during my fertile window but we used a condom and we even checked the condom afterwards to make sure there were no tears or holes. I also always have him pull out before he cums. I'm extremely worried. I've never had unprotected sex, and I'm not on the pill.  Could I just be skipping a period since I'm still a teen and I've been really stressed lately? I haven't shown any early pregnancy symptoms and it's been 3 1/2 weeks.