I usually have a 28day clockwork menstral cycle. i have now had 3 very heavy in 6 weeks. do i need to get checked or leave another month to see if things settle?what could be the cause? no changes, no medication but sadly gaining weight for no reason?

At age "37", in some women, delays in regular (ovulatory) cycles can occur, and with constant ovarian estrogen production , the endometrial lining can "thicken", with spontaneous bleeding an clots with breakdown of the endometrial lining. Ask your gyn about low dose oral bcp's, which stop ovarian hormone production and allow predictable cycles.