well since you didnt use a condom you can get pregnant.. and ur last period was at the begining of the month? around the time you had sex can be the dates you were ovulating.. even if you werent you can still get pregnant(but higher chances when ovulating).. you should start tracking your period and how often it comes... it could help alot
well now you have to play the waiting game and see if your next period comes (or at least until you feel "funny" lol)
and what would be the likely chance of getting pregnant because of this??