Pregnant so soon?

Hi guys. I had a miscarriage 17 days ago, I got positive tests for a week the negative tests after that..I tested today for no reason at all, and it came up as a faint positive. Can I be pregnant so soon? Im confused. I have had sex several times in the past 17 days but I didnt think it would happen this quick. Anyone had the same thing happen or is in a similar situation? Thanks x