According to this app my period should've come last week at that time it showed I was 12 days late. Then I started bleeding and its only 4 days and its really light. I'm not real sure how accurate these apps are so far they have been right on with tracking my periods. Only a couple days off like one or two day. But never a whole 12 days. I was just reading and article on here about implantation bleeding and it said that I could be pregnant. Is this a possibility? Has anyone experienced this? Please let me know thanks. Last time I found out I was pregnant I did the samething. Unfortunately I miscarriaged they said a baby never formed.