First week off the pill-feeling weird

I took my last pill on Sunday March 2nd and had my period starting Thursday March 6th and ending Sunday March 9th. My husband and I BD this Monday night just for the hell of it and about a half hour after, I started to have some cramping. I woke up today and felt better, but now I am feeling nauseous and having some cramping again. 
​Is this normal after stopping the pill? I'm sure it is just my body adjusting after having been on the pill for 7 years, but I just don't feel right and I wanted to make sure. 
​Thanks! :)  

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