Yes doctors have different opinions on when it's 'safe' to try again, but in most cases the only reason to wait is so you can emotionally recover, and to date any new pregnancy.
It may be 6 or so weeks before you have a period again, and the bleeding from the miscarriage doesn't count as a period. You could ovulate any time this month and could conceive. I conceived my son the day after my miscarriage (8 weeks) ended - the same can happen to you.
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