hi , Thanks For Your Question and Welcome To Health care magic An irregular cycle is typically an indication that your hormones are out of balance. It may be taking your body longer to heal after the miscarriage, or there may be an underlying medical issue. it may possible that your hCG levels are still high, there may be remaining tissue in the uterus that still needs to pass. If your body is unable to expel the tissue on its own, your doctor can give you medication to complete this process and help your cycle return to normal. Apart from this there may be other possibilities like You re not ovulating or You may have Thyroid Issue ,Hormones imbalance ... But it needs thorough medical check up and investigations to spot a confirm diagnosis so I would Strongly Suggest You to Visit Your Obs/Gyne to rule out the underlying medical condition I hope it help Thanks & Get well Soon