Hi Fiona
I lost 2 babies through miscarriage last year and I was told the main reason that they tell you to wait (physically) is so it is easier to work out your due dates. As bobbybob said, I have also been told you are more fertile following miscarriage so if you have been having unprotected sex, there is chance. I know how difficult it is following a miscarriage - you don't want to get your hopes up and if you are, you are really worried anyway, but I hope you take some comfort in the fact I am now 28 weeks pregnant and I didn't have a period after my last miscarriage. Good luck with everything
Px