I have this app on my phone that keeps tract of my periods. Every month it's spot on. The day it says I'm gonna start, I do. This month on the day I was supposed to start my period 5/13, It was like a pea size of blood mixed with some kind of fluid to make it kinda stringy. It was just that one time when I wiped. Since then there hasn't been any sort of blood. I did some research and most of that i could find was people thinking it was implantation bleeding. I took a test yesturday 5/14 and it said negative. Because the supposed "implantation bleeding" happened just the other day is it too soon to tell if I'm pregnant yet? Should I wait two weeks and take another test if I still haven't started a normal period by then? What should I do?