Years ago when we first were ttc I always tested before AF was due.Now I know not to test until AF is late.Its really hard to hold out but I hate looking at a HPT thats got a BFN on it!I was never obsessive about it though.I'd only do like 2 tests maybe a month. This month AF is late)or out of whack from pregnancy)and I only did the one test, so I think I'm getting better!