Did I have a miscarriage?

Okay, so I never thought I was pregnant, but I’ve had the weirdest period ever today. I almost had unprotected sex about 3 weeks ago and I’m not on birth control. He only put a little bit in and claims to not have came, but we were both drunk and I don’t really know what happened. Anyway, I normally have pretty average periods. This is the first period I’ve gotten since that night, and it’s not normal. On day one, I was having backaches and almost vomited multiple times. Today I almost threw up, had bad cramps, and I had huge blood clots that are waayyy bigger than usual. One of the clots was even about 3 inches long and about 3/4 of an inch wide. I also had a pinky/white discharge on my pad too. It’s just been a really odd period. Am I just paranoid or could I have actually had a miscarriage?