Birth control & pregnancy

Okay so this is my chart  the hearts say when I had sex with my husband he went inside me. 
I have a bad memory and have been stressed an busy and have missed a few pills this month more than I should have. (Please don't judge) my question can I be pregnant by this app I am supposed to get my period in 3 days  . I am spotting really light right now I guess. Could that be implantation bleeding or my period?