Ultrasound and blood investigations required

A regular cycle with a much shorter or lighter bleed usually means ovulation is still happening but the lining is building up less than before. Thyroid imbalance, low iron or vitamin D, significant weight change, high stress, heavy exercise and recent hormonal contraception are the common reasons. Less often it reflects the lining itself, for example after a uterine procedure, or reduced ovarian reserve if there are other symptoms. Since the timing has stayed regular, a lining or hormone cause is more likely than a structural one.

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Yes,ultrasound scan and blood test to know the reason.