What Causes Severe Pain In Pelvis During Intercourse Along With Nausea?

My husband and I had intercourse the other night. Towards the end, he penetrated harder and I felt sharp pains in my pelvic area. I have felt pain before while having intercourse but nothing this intense. Thinking it would just go away, I began to get ready for bed. As I was lying in the bed the sharp pain came back and only progressed to get worse. I sat up to see if the would help and nothing would ease the piercing pain. I got up to go to the bathroom and could barely walk. I sat on the toilet as not only the pain continued, but I begin to feel nausea and like I was going to faint. My husband quickly put a cold wash cloth on my neck which seemed to help somewhat. I was literally in tears. Finally after five minutes or so the sharp pain in my pelvic area eased up somewhat enough to where I could go lay back down. It has been three days and my pelvic area still is aching, mildly, but I still know it s there. I have researched and seen several answers that lead to a ruptured ovarian cyst. I m not sure if that is what it is. I am only self-diagnosing. Problem is, my husband just started a new job so we won t have medical insurance for three more months. I feel maybe I need to go get checked but again maybe I am just overreacting. Can someone help me figure out what may of happened?