as far as i know, after a miscarriage you have less of a chance (chance like anyone else) of a second one within 6 months but if you do not try to conceive until after 6 months it may be harder to get pregnant, if the reason for the miscarriage was natural and not the shape of your womb/body.. if thats worded correctly.. just some people are prone to miscarriages, very few though. i am sorry for your loss and wish you the best with trying again :)
I dont think so but you should really Ask your ob. I was told from my ob that a previous miscarriage doesn't have anything to do with a second pregnancy