Period came 2 weeks early. Is it a period?

So I got my usual period symptoms 2 weeks before it's supposed to come but this time no cramps. I noticed some light bleeding and it seems to just keep coming. I'm about to sleep now but will check again in the morning. I had protected sex last week on Tuesday and I'm always protected. Am I pregnant? Is this implantation bleeding? I feel a bit nauseas but I always do when it's too hot, I'm tired or I've stayed up late at night which I have. I've never had a period come 2 weeks early or so far from my usual dates so really worried. Don't really want to have a baby at all right now. Help?