Painful orgasms at six weeks (TMI warning)

I had three orgasms from week 4 to week 6 pregnant. And I have seriously great orgasms but the pain after is scary. it doesn't last more then ten minutes but it feels like cramping bad and I get nauseous  from the pain. I'm so scared to have another one. Has anyone else experienced  this??! Should I avoid this? I heard its normal but it doesn't feel right.