Could I be pregnant already?

My husband and I just started TTC on the 5th of June. I've been off birth control for a few months now but the 5th was the first day we decided to have sex without a condom and start trying. My period was then due on the 12th. It's now the 18th and I still haven't gotten my period yet. Could I be pregnant already? I wouldn't think so since I wouldn't have been ovulating and since it hasn't even been 2 full weeks since we started trying I wouldn't think I could test that soon, right? I need opinions!!