TTC - 4 Weeks late

Ka

Hay y’all, my husband and I haven’t been trying very long (Since September 2019) and I’m now four weeks late. I feel like I’ve taken 20 tests of various brands between now and since the first missed week. however, they’ve all been negative. Anyone else has long standing negative tests??? I called my doctor but they said to wait another week before going in for a blood test. Thoughts?!