I usually keep track of my period with an app on my phone, and my period is usuallyon track with the app.. I got my period on July 11th and the app said I was suppose to get my period on the 8th, well 9 days later I still haven't gotten it .. I am sexually active so there is a chance I could've pregnant.. I've taken 4 pregnancy test 2 in the morning and two in the after nono spread out within a couple of days, all were negative.. Also a couple of days after my missed period there was super light pink blood when wiped , not a whole lot and it didn't last long more was it enough to be considered spotting.. Am I pregnant, if Not what could be going on?!