Round ligament pain

So I have been having what feels like round ligament pain for the past 3-4 days (today is 4/28). I had 2 5day blasts transferred last Tuesday 4/19. My beta is tomorrow morning. I've never ever had this feeling before except when pregnant with my daughter. However I was like 10-12 weeks when I had ligament pain. I am stronger than when I was pregnant with my daughter and have been working out regularly since June of last year. I hadn't worked out in months before getting pregnant with my daughter. Could it be muscular, RL pain, side effects of progesterone or estradiol? Help! The suspense of this beta is making me crazy!