Hello ma'am and welcome.
It may sometimes take time for your menstrual cycle to return to normal after a hormonal
course of medications. But in my opinion the cause here is probably polycystic ovaries
This condition also makes it difficult to lose weight. I would recommend the initiation of a medication like metformin
which will help normalize your menstrual cycle and promote weight loss
. Please speak to your doctor about it.
Hope this helps.