My (39m) wife (37f) got pregnant by a sperm donor against my wishes. Do I raise the child?

My wife and I have been married for 8 years. We dated for a few years before getting married. We were in school for the first few years of our marriage. After finishing school we tried to have kids, but it didn't work. My sperm was tested and my motility and morphology were on the low end. We tried IUI three times and then we tried a round of IVF which didn't work. She was upset and worried about running out of time to have a child. My wife told me she wanted to use a donor. I said I was opposed to it. She went ahead with it anyway and on the second try it worked. Now I feel conflicted. I don't want to raise a kid that isn't mine. I wanted to keep trying to have a kid together. Should I stay with her and raise the child? I love my wife but this feels like a betrayal.<br><br>UPDATE:<br>I signed the agreement. It's been hard reading all the comments about my lack of role in the household and her cheating. I took a look at her phone and did see a photo of her with a woman. I told her we need to talk but for now she is mad at me that I looked at her phone. I know I should have trusted her and been more involved at home before now. I've long worked more hours than her. The pregnancy was her only betrayal to me. I'm going to work on changing that. I'm also going to call the clinic tomorrow and see if I can cancel everything. It's sad looking back on all the eggs we spent all that money on that never turned into a baby.