Ob-Gyn questions? Ask a gynecologist online.
at first I would recommend to do another urine test from pharmacy. If the result is negative again, hormonal imbalance can be the reason for this problem. Then you should visit your OB/GYN, he can do a checkup by ultrasound and provoke bleeding with a hormonal medicament which has to be taken for some days. Afterwards menstrual cycle will occur regular again.
Dr. N. Scheufele
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Thanks a lot, all the best for you,