Cycle frustration!

C
So af was expected to come on Sunday  and here it is Wednesday and it's still not here. Pregnancy tests read negative. My periods have always been on time and definitely never this late. I have had some very light spotting (almost just a darker colored discharge) but nothing more. We have been ttc and I'm hopeful it may be the month but the negative tests are making me doubtful! Advice? Anyone been in this situation?