Really sorry you're having to go through this Petra, I know how frustrating it is. I had a m/c in August last year and didn't get AF until early January. I went to see my docs a few times and they just kept saying to give it time and that my body would kick back into action eventually. I also had hormone levels taken which were normal, so no real explanation why it took so long.
Now when I think about the last few months, I remember having twinges and cramps quite regularly and think it was probably my body trying to ovulate but not quite getting there; have you had any signs that you may be oving, are you temping, etc? I started using OPK's every time I felt any unusual twinges and eventually one came up positive - I was over the moon!
Fingers crossed you don't have to wait too much longer for AF and don't forget we're all here for you any time you want to chat.
Emma x