if its a natural miscarriage and you had no problems, you can try again straight away, you will have to wait for your hcg levels to drop and that can be different in the time it takes for each person, once they get down to aroun 10 and under you will ovulate, I had one in november and ovulated 16 days after the start of the miscarriage, so you can get pregnant straight away and not even have a period, as long as you feel physically and emotionally ready, good luck :)
I'm not sure how long it'll take. I had a miscarriage back in September and my doctor told me to wait a few months before trying again to allow my body to heal