help me!!!

I had protected sex on 4/18/19 which was 2 days after I stopped ovulating. I’m supposed to start my period on 4/26/19 but I started blessed today, 4/23/19. I don’t know if it’s too early to be implantation bleeding or if I started my period early. Not to mention I am having slight cramps and a headache like I usually do when I start my period. Please help!!