9 weeks and sex hurts. Why?

Rashelle • Hailie Rae❤️ Jan/25/2011. Wyatt Spencer ❤️Jan/24/2016
When me and my SO have sex almost every time I have to stop because I start cramping bad. The other night I was cramping bad I was crying. We stopped and nothing was bleeding but it sure hurt for a minute. What is going on is this normal?