Intense lower back pain/pressure

Stephanie • 31 • Married 7 years • Miracle baby 5/20/20 • Dog Mom x3 • 3 Failed IUI's • First IVF 6/15/19 • Miscarried 7/18/19 👼 • FET 9/6/19

Anyone else experienced this? It just started this morning and comes in waves, with some cramping. 9 wks 6 days. I'm worried. 😔