Just Confused

So my husband and I have been trying to conceive with no prevail. I have a regular cycle, and the symptoms run like clockwork. Always starts with sore boobs, next is a break out on my face, mood swings and then my period comes. The weird thing now is I'm bleeding but with almost a complete lack of any of those previous symptoms. No sore boobs, no break out, no mood swings. I began bleeding three days late. My confusion is that it is substantially heavy. It started off light then got heavier I guess I should say. Just a little confusing, could it be implantation bleeding or is it just a weird month for me?