What do I do?

Okay, I did something dumb please don’t come for me. I scheduled my surgery for a laparoscopic bilateral salpingectomy and it’s happening in two days. Welp, here’s where I probably messed up. I only just now called my insurance to see how much was covered, and they said I’d have to pay like $4k or something. I live in the US, and the procedure code and pin is the same I see everyone else posting here, so it should be covered 100% because of the ACA right??? Please help I can’t afford that but I’m not about to cancel my surgery either