anyone else experience this from plan b

Belinda • 22. nursing student. ma.
So I had unprotected sex last week, no condom and no birth control. My boyfriend and I were out drinking but by the end of the night we sobered up and ended up having sex for the first time. It obviously hurt because it was my first time so i told him to stop before he finished.
Naturally as a paranoid girl that I am, even though he didn't finish I still wanted to take plan b just in case since it was unprotected.
The next morning he bought me plan b and I took it. I started ovulating the day after so naturally (a week later) I got my period again since plan b basically forces you to get your period.
But this time my cramps hurt WAYYYYY WORSE and my back hurts WAYYYY WORSE  than usual. 
Has this happpend to anyone else? I learned my lesson though, lol. Always stay protected. 

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