11 days late & negative pregnant test ? HELP

Cindy • Mommy of a Princess & Queen to a king 💍

I was suppose to start on the 6th due to the app , and never started , took pregnancy test 2-3 days ago and negative.

Last month I went in cause i had 12 day period and got boood work done and they said i was fine , I’ve been trying to conceive for 1 year and 1/2 . No luck yet , this is strange for me. What else do you guys recommend getting checked up on?