2 weeks birth control and no period?

I was put on birth control for two weeks to regulate my hormones before starting clomid. I went in last week after stopping the birth control and they found a cyst so they wanted me until my period started to come back in and do another baseline ultrasound. Since my appointment last week, I haven’t really gotten a period. My doc said I would within a few days of coming off the pill, but I really only experienced some mild spotting for a few days. I’m going back in tomorrow to redo my baseline and I’m hoping things look ok to start the meds. Has this happened to anyone else? Thanks!