I had my second trimester miscarriage on April 2021 and I faced irregular periods after that so doctor put me on birth control pills for four months and after four months I came for follicular study .my follicles are going good till 24mm and rupturing on its own but my lining is not growing eventhough with progynova ( endo thickness is 6mm during ovulation for the past two cycles ) * Good triple line pattern is there What might be the cause for this .anyone please explain .. I had conceived naturally before but now endometrium thickness is not growing . Doctor suggested hysterscopy. Is it necessary?