TY - I've been struggling with the same question. My take is that some dr's recommend waiting up to 3 months, while others say it isn't necessary to wait at all. Also, I think that some dr's want you to wait at least 1 month so that you know when your last AF is so that they can date the pregnancy - but with the sophisticated ultrasounds they have, this isn't really necessary as they can date pregnancies from the size of the fetus measured during U/S. I think a lot of people would also say, it depends on how you feel physically and mentally. I think there's no single right answer. I do know that my dr was very clear that I shouldn't have sex or even swim until all bleeding had stopped as both increase the risk of infection. This may only apply to a d&c (my situation) and not all miscarriages - I don't know. I've decided to wait until 1 regular AF - and even if my FS won't do IVF so soon, at least we can give it a go on our own...but this is just our personal choice.