It hurts

My boyfriend and I were doing this morning. I was fine until we switched positions. Doggy style has been an all time favorite or mine, but not today. After doing missionary, then changing to doggy style, which is normally what we do, I was in pain. Every time he stroked in it hurt so bad on my lower left side. I made him stop. Then it went away so we continued. It came back and now it won’t go away. It like I’m cramping on my left side. But I’m not supposed to start my period for another week or so. I’m worried but don’t want to cry wolf. Any ideas or suggestions?