Sore boobs since TTC...

Samantha • We are expecting baby girl #2 on 10/31! Can't believe the changes coming!I work full time as a Vet Tech and live in Maine.
I never ever used to get sore boobs unless I wore a different bra. Now, we have been trying to concieve for 6 or 7 cycles (lost count) the past 3 cycles, the day I ovulate to the next day my boobs become sore and stay that way until AF arrives. So yes, the entire two weeks, I have really sore boobs. Does this happen to anyone else by chance? I was just in 2 months ago to my drs for a routine physical and he stated everything looked and felt good. I mentioned it to him where at the time it had only happened once and he said to just watch it as there didn't seem to be anything wrong. It's just really strange to me where it is only since a few months into TTC...anyone else in the same boat?? Or possible ideas why??