My first scare...

I have only had sex a few times and one of the times it was on the last day I was ovulating. We didn't use a condom but he pulled out. I have been very worried about it all week now. My internet searching hasn't helped either... I have tender breasts, a craving for sweets, tiredness, and constipation. All of those things could be signs of pregnancy. What do you all think? Am I worried for nothing? What should I so?