Is this my period

I'm not sure if I have my period, implantation bleeding or spotting. I got bleeding on wensday around 6 in the evening ( today is Saturday) and I am bleeding really light if even any. I have been bleeding red blood very lightly since wensday but at sometimes of this 'period' it was heavy blood. I'm just confused as it does not feel like my period but I had bad cramps. This bleeding came only 2 days before my expected period but could this be happening as I have taken 2 emergency contraceptives 2 months in a row?