Our expert says:
If your are registering your menstrual cycle from first day bleeding to the first day of next bleed then a 21-day cycle is clearly abnormal. However if you are excluding the bleeding days then the likelihood of implantation should be considered and a pregnancy test should be positive within a week of the cramping incidence. However this must be a blood pregnancy test and not a home urine pregnancy test.
Answered by: Dr M.I. Cassim
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