Have you girl ever felt this? Something like this?

Hi everyone! I am just wondering if anyone can help me out with some insight on something. I am 27, have been with my boyfriend for alittle over 3 years and have been "trying" for a few months. My periods are usually regular etc. I have been experiencing lower ovary twinges of pain on my left side that I've never had before. I am due for my period in fourish days and during this cycle was intimate several times in my ovulation window. Any thoughts on what that is or if anyone had experienced this prior to their periods? Thanks so much!! :)