My condolences for your loss.
When you are pregnant, one of the pregnancy hormones (called hCG, or measured in your blood as “beta-hCG”), among other actions, prevents you from ovulating. After a miscarriage, it takes a little while for the level of hCG to fall enough for your ovaries to begin ovulating again. Even low levels of the hormone effectively suppress ovulation. How long it takes to fall does vary, and depends on how high it was to begin with, and how “complete” your miscarriage was. It may fall faster after a D&C. Your GP could request a beta-hCG test to ensure it is negative now, or at least falling. There are rare causes of persistence of hCG, but these would be evidenced by an unusually high beta-hCG and your GP would refer you to a gynaecologist accordingly.
It is also worth mentioning that it is possible to fall pregnant again before your next period so, if your beta-hCG is high and you've been sexually active since your miscarriage, your GP would arrange further tests/ultrasounds to clarify whether this is a new pregnancy.
In terms of when to try again, I'd agree with my colleague above that waiting for your first period helps you “know your dates”. Otherwise, there is no need to delay trying again any longer than is necessary for you and your partner to feel emotionally ready.
Best of luck :)
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