12 days late, bfn.. Confused

Katey
I'm now on cycle day 42! I'm 23 and never had a cycle longer than 32 days. I've taken around 4 tests and they are all negative! I have no signs of AF, and no signs of pregnancy other than being unusually tired. 
​With my last pregnancy I didn't get a positive until I was 11 weeks and starting to vomit. So I'm starting to think that's just how my body is.. 
​I'm just so confused!