Hi pet, hope you are well. I dont think there is a 'normal', everyone is different. It averages about 4-6 weeks, think it can depend on how far along you were, and whether you had a d&c. Lots of different factors. I will be 28 days come Friday counting from the first day of mc. I think that it depends on how long it takes for the hcg hormone to leave your system. I was just short of 6 weeks too and mc just after you. The answer to your other question is definately yes. You can get pregnant before first AF. Im taking temps which are really high, would expect to see a dip just before AF starts. I suppose we will just have to be patient. Let me know how you get on.
love Tracy xxx