I had taken 72 hours tablet in the month of may 2021, next month ,i had my periods 15 days late, then in july I had proper late periods but in the month of august, I didn't had my periods of spotting, few drops but no proper bleeding at all. Still in this month of september, till now no periods, sometimes I feel periods pain but no bleeding, and I am not pregnant, I already did 3 4 times pregnancy kit test, it's negative. I was taking rajaparvatni tablet too but no benefit. Please suggest me what should I do? Why I am not having proper periods from last 3 months.