I had my first depo-provera shot thursday the 29th and had unprotected sex 2 days later, could i be pregnant? i should be starting my period in a week or less

Maybe not: Depo Provera (medroxyprogesterone) is most effective if given during the first 5 days of your period. If it was given then it is usually effective by the next day or so. If you were given Depo outside of the first 5 days after your period, you will need around 7 days before it is totally effective. From your question it sounds like you were not in the first 5 days and you might not be protected. Talk to your doc.