Withdrawal bleed possibly???

Ju

I’m doing a ERA test this cycle. On 3/6 I was put on birth control. This day was also the last day of my menstrual cycle. My nurse told me to stop taking the BC on 3/20 to add estrogen tablets and next week well add progesterone tablets and shots. Well I started to bleed on 3/22 and I still am. Is this normal? My biopsy is 4/8.