I supposedly started my period on the 28th that first day I had cramping which I usually really painful but it wasn't too bad but still caused me to be nauseated and it was kinda heavy at first. But sometime the 29th I started to barely bleed and most of it looks to be old blood and some of it has been pinkish brown and at times I noticed something of what I thought to be mucus once or twice. My period normally lasts up to 5-6 days but it seems to be barely lasting up to three. And before my cycle during my fertile window and the day and two before I ovulated my bf came in me twice... So is it implantation or period?