False negative?

First day of my last period was May 26. I'm a week late. I've had some bouts of extreme bloating and constipation which are not normal pms symptoms for me. Also random nose bleeds? Not sure if that's related or not. I've taken 3 tests, all very negative. All of them were blue dye tests. I've been reading that those aren't reliable? Does anyone think I might be getting false negatives? Not currently TTC but if I am it would be okay. Our son just turned 1 this week haha at least they would be close in age.