Week late and negative hCG tests!

Im now on cycle day 36. Im always 28 day cycle. Currently TTC

Mega crampy all week. Done 4 hcg tests and all BFNS.. sick of seeing 1 line and never been late for my period.

I have had emotional trauma the last month being seperated from my son whom now lives with his dad *please dont judge..long story.. ive been so upset being seperated from him.

Has anyone had missed periods from being too emotionally upset or stressed?

I do have a doctor appointment on Monday.