Back pain & serious contractions.

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So I had sex with my bf about two hours ago. & afterwards started having cramps or contractions I really don't know. They have been getting worse and worse though. & unfortunately I just started timing them, I wasn't timing them the whole time. The pain is like making me wanna cry & wraps around my lower back too!! 
Now I know sex can make u have Braxton Hicks but do they get worse ??? I'm scared.
I live 40 minutes from hospital so I can't just drive there crying wolf.