Back Pain and Periods-Endo?

I am currently experiencing my first period since having a partial molar pregnancy end in January. The back pain I’m experiencing is horrendous, I can barely move or walk. I also had terrible back pain when I discovered I was pregnant with the PMP pregnancy. And looking back before that pregnancy, I also had back pain for sure with another cycle that made it difficult to walk.

I have had lots of testing done for RPL, but despite having heavy periods, no one has looked to endometriosis being a cause. I don’t typically get cramps, but I do have a tilted uterus so perhaps back pain makes more sense. My pregnancies (3) always develop heartbeats and typically make it until 7-9 weeks before passing away.

Trying to decide if I need to push for endo testing. Any thoughts?