Need answers! Please help!!!

Keeya
Ok yesterday I went to the ER for sharp pain on my right side. They told me my cervix was inflamed. They did a pregnancy test (6 days late) and it was a BFN. They told me to call my OB to get a blood test for Wed. I'm 7 days late and don't want to wait that long. Ugh have this happened to any one else and got a BFP with the blood test days later?