Late period. Stress? Help! READ!

I am currently 5 days late. I took one pregnancy test when I was 2 days & got a bfn & today I took one & got another bfn. I was on the depo for many years and then I had my daughter in 2009 after being off it for a year. I have been off the depo for a year now as well & we have been trying. Last year I had a cone biopsy done due to adenocarsinoma (cervical cancer) so its been kinda rough for us. What are yalls opinions & advice? I have had no period symptoms, no sore boobs, headaches, or premenstrual cramps the only thing I have had is irritability, light what feels like ovulations cramps & I have been moody & have had some trouble sleeping. Please any advice is welcome!