I am another pregnant DBer. I am 22 weeks along and also a runner. My H had the same reaction, that I did this on purpose. Really?!? Um, no. Good thing that when we went to the Dr, it came out that I was in fact preggo before he told me of his A. My sitch is different in that my H is a serial cheater and is currently sleeping with 2 OW...so I'm done. But, I know all the emotions you are going through. Scared, sad, mad...want to beat him. Her, God for allowing you to get pregnant.
But, no matter what, this baby is a gift. Try to allow some excitment. It's hard.
My first suggestion is to really think about some boundaries. When my H was still living in the home, I had a very calm, frank talk with him about OW. No talking or texting from our home. You are pregnant and need to keep your POM for yourself and your baby. This is so stressful, so try to minimize it as best you can.
I'm here for you, this is so difficult.
M: 9 yrs T: 13 yrs H:34 Me:35, S4, D2, S 7 months Dday 11/12-PA & multiple PAs Dbing 12/12 S 1/13 7/13 H moved back in basement. 8/13 #3 born 10/13 still cheating 10/13 He moves across country, I file for D