34 years old, 3 years ttc, 9 days past period, 3 bfn's

Kathy
That pretty much sums me up right now. I don't know what to do. I took the 1st test 2 days past, then 4, then 6 days past when pd was supposed to start. ..all bfn's. I'm trying to wait longer to test again. Through my life I have been pretty regular with pds 25-30 days, except during high stress times. I'm a teacher and I have just started a new school year in a new position so I don't know if that is what is throwing me off cycle. Any advice? Hope? Ladies in/been through similar situations? It has been a hard 3 years of monthly disappointments.