i was a week late for my period and it came the day after i drank a lot of alcohol celebrating my friends birthday. it wasn’t like a normal period and the cramps were really bad and were the worst i have ever had and my lower back hurt too (it doesn’t usally when i’m on my period). and i passed a lot of blood clots (but that wasn’t normal for me on the first day of period). i had sex but the condom broke but he pulled out as he was finishing. i didn’t take a test so i don’t know for sure if i was.