Is it implantion bleeding or my period?

okay so. my last period started on the 26 of dec. wish means i was supposed to start until the 24 of this month. well i had unproductive on the 1-2 of this month witch means i have that chance of being pregnant. but i started bleeding today. so what could it be? i have had some of the symptoms of being pregnant like, sore , tired, felling sick, i haven't thrown up yet but i have been gaggy, cramps, gy. so could someone help me please.