Is there any research into risks of getting pregnant before 1st period after mc?

[Zoey36]

I've read stories of people conceiving a short time after a mc and everything bring fine and I've read stories of people miscarrying again and theories about insufficient womb lining....
but is there any actual evidence or research?
Is the only reason we're told not to get pregnant before a period because of dating ? Or is there more than that?

Thanks!

I was told by my doctor there's no reason to wait!
I know it's not medical research but I got pregnant again after mc before a period and it was a healthy pregnancy