Megan, I don't know if this will be useful, but I bled after my GCS too. It wasn't during dilation, but during sex with my boyfriend, who was a big man. I consulted a gynecologist who looked inside of me with a camera and saw a patch of the lining that simply hadn't healed following the surgery. He gave me a large, plastic syringe that I filled with an estrogen cream and injected into my vagina. It was decades ago, so I'm unsure of the time frame, but it wasn't long, maybe a week or two, and he looked inside me with a camera again. He was so amazed at the improvement that he asked me if a couple colleagues could also look.
He was a highly experienced gynecologist and he told me that if I hadn't shared my background, he would have assumed that I'd had a hysterectomy. He also asked if he could consult with my surgeon, Eugene Schrang, and I told him that was fine. The gynecologist wanted to do how Schrang did what he did. Anyway, after that patch healed, there have been no problems since, so I hope you too can find a one and done solution.