Possible problem with First Response?

McKenzi

Hey y’all! So AF was supposed to be here 2 days ago. I normally have very consistent cycles, usually 28 days. I’ve gotten BFN on DPOs 8,10,12, and then today, 15. I’ve felt weird lately, but chalked that up to stress, and assumed AF was coming. I’ve only been using the first response tests, and didn’t know if anyone has had issues with them giving false negatives?