Suggest Remedy For Irregular Menstruation

Hi, I had my last periods on 12th Jan followed by spotting on 25th Jan. Post that, there has been only symptoms of menstruation but I have not got my periods. I underwent some tests (ultrasound) including pregnancy, and everything showed Normal result. Pregnancy was tested negative. Later, my doc suggested Regestrone 5mg for thrice a day for 3 days. I have done that. Today is the first day after completing the course of 3 days. There is only some cramps that I have been experiencing .