Help confused

I recently miscarried in January at 7wks4dys. I had my first cycle following on 21 February. I have yet to have a cycle since, we are currently trying for our rainbow baby but I'm not sure what's going on with my body. I've taken multiple test and all negative. I'm so confused. My cycles before were 25 days and like clockwork any insight would be great. Thanks in advance. I took this test yesterday morning 4/3 with fmu.