Help!!

So about a week ago now i had my period and everything was normal, flow etc anyways well the day i was suppose to get off i had very light bleeding and its still happing now its not enough to fill a pad but its about a teaspoon size, i tried reading up on it and it said i could be pregnant which i was intamit about 2 weeks before my period which i thought wasnt possible anyways the light bleeding is still here and i kind of dont want to tell my mom because im 16 and me and hers reletionship is really rocky do any of you guys know what this means ??