Please help a FTM!!

I hope someone is awake... I have been having really bad period cramping for the past 2-3 days.

My husband and I had sex around 3 and immediately after I have been cramping they hurt so much. I began timing around 3:58pm. I thought maybe I needed to poo so I sat on the toilet and I did but when I was done the cramps are still there. They go away and then come back. When I stand up they feel worse. Should I call L&D to see what they think? At my last check up I was 3.5cm and 70% effaced