With both of my kids I tested BFN until I was 5-7 days after a missed period. With my DD, I charted and KNEW that my temp stayed high and I *had* to be!! but it took forever. With DS, I must have taken 50 tests. We were NTNP, so I knew it was possible. It was very frustrating. Which is why I am resisting the temptation to test, even though I'm dying right now! I know my body is mean and even if I am, it may not show up yet