I generally have a heavy bleeding during period for first two days and very light to bill next 3 days. And the days between cycle are also standard. Now I got my period two days earlier and the flow is thin and very light comparitively almost 4 days now. It's like the flow can fill only half thin pad. Breast and nipple soreness is too much than earlier. And light cramps in lower abdomen which r very less and diff from all the other times. Can this by any chance be implantation bleeding? Or is this hormonal imbalance starting?