Confussed !!!

So I was due for af on 11th thought I was out !! But af still a no show with all test bfn !?! All signs of af but no actual af and now feel like tightening in my uterus area !! Im so confused dont want to go to doc for blood work incase it still negative ! Trying not to get hope up but been trying so long its hard not to think about ! Please can any1 help or had something similar or know of any1 who has ?!?