Late period but negative tests?

Alixandrea
Shark week was supposed to start on Friday but still hasn't. I was SUPER emotional over the weekend (like crying because the dog barked) and I'm not sure what's going on. I've taken 3 or 4 tests and are all BFN
We have been TTC for 2.5 years and nothing yet. 
I guess I just need some encouraging words or someone to tell me I'm not going crazy lol.