TTCing, do you mean you had a miscarriage for your fresh? SOrry if you are not and this question offended you.
Coz, for me, I had a miscarriage for my first attempt of IVF. Went for D&C and i did not bleed heavily after that. Had my so called first menses a month later. But within the month i bleed again and it did not seem to stop even after 2 weeks. So when i had my post review with doctor for my procedure, i told him what happen. I was given a choice. To let it flow and it will be back to normal or get a pill to regulate it. I took the pill coz the bleeding i got was very scary and there was a point i felt very week coz i think too much lost of blood. After the pill which i took may be around 2 or 3 weeks, i had my normal menses again.