So for the past 2-3yrs my cycles have been normal , I'm never early or late . Well yesterday I started and it's 4days early for me , I'm wondering if it could be implantation bleeding or early period? I'm thinking implantation but I'm also having cramps and it's kind of medium like. This would be my 2nd pregnancy but miscarried with the first one almost a year ago but can't remember if I had the implantation bleeding