Periods occour when progesterone tab given and withdrawn, over estrogen primed inner layer of endometrium. If ovarian and endometrial phase is different, period can get delayed.. some time it can take 10 days or more . If inner layer is not primed with estrogen hormone then chances period can delayed more or only spotting can occour.. ( in case pregnancy is not there)
Consult with gynaecologist
Next Steps
consult with gynaecologist