My last period was dec. 25 I have yet to start since then, but last week I went for a blood test and it came back negative is there a chance I could be pregnant

Being it is about 2.5 months you are late. I'd say the odds are pretty strong unless you have a history of very irregular or missed periods in the past.

I'm with smoothy here as there is a high chance that you are pregnant, what you should do is go and get a pregnancy test done (always do two) if that comes back negative than you should prob book in to see a doctor just to check that everything is okay as that's what they are there for isn't they, good luck.:)