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normaly after the last dose of clomid
over, one will ovulate within 5th to 9th days. it means if you took last dose on suppose 3rd dec
. then you will ovulate between 8th to 12th dec. just have regular intercourse within the fertile period, or say atleast alternate day. if your menses is late it has nothing to do with ovulation under clomid. it has to do only if one is not on clomid. so be relax and try.
I hope I answered your query. Wish you good health.