What are my chances of pregnancy?

Ok.. so for like 2 days this weekend me and my husband had unprotected sex. I ovulate this week. Actually I think I did earlier today, I can usually feel it. What do you think my chances are??? I don't want to get my hopes up. We really don't need a baby right now, but we'd be thrilled to have one. I've gotten my hopes up too many times. I don't wanna feel let down again...