3 days late am I spotting or on my period?

Karissa
My period is three days late (normally very punctual) it just came but it is pretty light, like a light pink color where mine is usually really heavy then gets to be about this color on like the 2nd to last or last day. So I'm not sure if this is actually my period or if I'm spotting and could be pregnant? I just want to be cautious just in case...