L.M.
Definately talk to you doctor...you may want to try to get in early.
I did experience this but it was back when I was a teen, wasn't sexually active yet. My periods were horrible but I would also get cramping all month long. Sometimes I could barely walk to class...if fact, my boyfriend even carried me to homeroom would day because of it. At the time, they gave me naproxen to start taking a few days before my period...which helped but didn't stop the all month long cramping. They put me on the pill to regulate my cycles (including the cramping) and it helped dramatically...periods were still horrible though.