Your HCG needs to be 5 (0) for you to ovulate again... hence why you dont ovulate whilst you are pregnant, which then makes you more fertile after miscarrige, termination, birth, Because you've been preg, havent ovulated therefore ovulate for a while (But not ovulate) if that makes sense?
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No, HCG prevents ovulation so you need to go back to non pregnant levels to ovulate again.