Well I started bleeding yesterday and my DR told me I will have to get AF again before we can TTC again

He said that I would have an increased risk of M/C because my uterine lining would not be shed properly until I get AF. I see alot of you who say it is ok to get pregnant after a natural M/C. So I am just confused now

Could it be because I was on a prgesterone supplement??
Any answers or advice would be welcomed!!!!