I'm 33 Weeks Pregnant And Two Mornings Ago My Partner

I'm 33 weeks pregnant and two mornings ago my partner and I had intercourse, not rough or anything just relaxed normal intercourse. After that I got up to the bathroom and I got this horrible severe sharp pain in my lower left part of my stomach, between the private area and stomach. I tryed to lay down for a while to see if it would go away and it didn't it progressed and continues now but not as bad as yesterday. I could nearly move walk or even sit . Every time my baby moves around in my tummy its horrible pain. I never had this happen before . This is my fourth pregnancy. What does this mean????