Cramps way before period is due

My period is due on the 16 or sometimes after that. But lately I’ve been having cramps. Like really bad. I could be pregnant because me and my SO have unprotected sex and he doesn’t pull out. I’ve never had this problem before. What do you think it could be. I’m like on Cycle day 18 and I don’t think it could be from ovulation. Any ideas ?

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