Pain in pelvis

Jocelyn • I`m 27 and my husband and I have been TTC for baby #1 since October 2014. After 2 years of trying and 1 round of IVF we're finally pregnant
I'm suppose to be in the middle of my fertile week (according to glow) and I'm experiencing pains in the middle of my pelvis (uterus). Just wondering if this is endo pain or ovulation or even implantation pain??? Also as a side note I had sex with my husband last night and it was quite painful and not enjoyable. Any ideas would be greatly appreciated.