What are the chances that I'm pregnant?

I've had with my boyfriend three times now. Each time we used a condom with spermicidal lubricant, and they weren't expired. He didn't inside me on any occasion. I've been experiencing some insomnia and fatigue, but I think it's due to caffeine and the antibiotics I'm on right now. I'm not yet late for my period, but I'm getting a little worried.