what the EFF is wrong with my body?

Kay
I am 8 days late for my period, and ALL BFN's... I'm starting to go crazy, I've heard it could be stress or travel? But most stuff says it's because I didn't ovulate but I definitely did- tested with OPK's and the whole bit...
Any idea what might be wrong? Any words of encouragement would help, is it too soon to see a doctor?