Pregnant and panicked

I am 13 weeks pregnant, I go in for my next appointment tomorrow.
I just found out that my husband cheated on me in January of 2015. He isn't aware that I know, and I have no idea what to do. Do I confront him? Do I move on? This is my first pregnancy, and now I am feeling so inadequate and as if everything leading up to this was a lie. 
What would you do?