No period for 6 months!

I did a FET in November and had a miscarriage is December and I had a D&C right after that. I have no had a period at all since! It’s been 6 months! My reproductive endocrinologist keeps pushing me off and saying there is nothing wrong but this doesn’t seem normal and I’m worried that something is wrong. I am not pregnant and have not had any cysts. Has anyone had a similar experience? If so what was it and how do I get my doctors to take this more seriously?!

Update: I have taken Provera to start my period 3 times over these 6 months and it still hasn’t come. Finally after an appointment on Friday my RE agreed to see me herself and do a water ultrasound to try to see what’s going on!