What could this be?

I'm 22 and me are my bf are trying to conceive our first child together. I ovulated the 3/15-3/22(according to the app) and I'm scheduled to start my menstrual on 4/2. It's normal for me to have soreness around my nipples 7 days before my menstrual but this time they're more tender than usual and it started sooner than 7 days early. Why could this be? What would cause this? I almost wanna go to the hospital they're so sore. I'm not good at pain management but I'm not a big baby when it comes to pain either. HELP! THEY REALLY HURT