Is it possible it's late because I somehow jacked up my cycle by accidentally having sex on the day my period started? (He went to take the condom off and it had blood on it... no it wasn't a rupture or injury of mine or anything it was my period) The next 3 or 4 days my period was really heavy and it was shorter than my normal cycle of 5 - 6 days, and I'm thinking it's because of the sex. But that was on the 20th of October and it's now November 24th, my period is 6 days late (going by that 28 day rule which is was usually spot-on, give or take a couple days). We had sex again on the 11th but he never came or anything, HOWEVER, it was unprotected. He hadn't ejaculated in over a week and a half so there was (hopefully) no sperm in the urethra. How worried should I be? I took a pregnancy test a week ago and it came out negative but that might have been too soon.