Has this happened to anyone??

ฅ(• ɪ •)ฅ • ttc baby #2
I took a pregnancy test on the day AF was supposed to come but it was negative. So I waited to see if AF would come and I am now 4 days late (going to wait to test). Maybe it was a bad test?? It was from the dollar store, but I would like to know if anyone has gotten a few negatives but were really pregnant?? I just don't want to think I'm pregnant and be disappointed and upset again.