TTC after M/C but AF irregular

I had an early m/c in March this year after falling pg for the first time and even though I got af back the following month for 2 months it has now decided to disappear on me. I'm now 2 weeks late and I've taken 3 hpt and they have all been BFN so I know that I'm not pg.

I was wondering if there are other women out there who would like to share their experiences with your cycles following a m/c when you are actively TTC again?

Has anyone else ever had af come back and then have it stop a couple of cycles later?

I haven't been to see my GP yet about it. I was waiting and hoping that it would just be late but 2 weeks late feels like it just isn't going to return anytime soon.