Not What I Had Intended

My husband and I have been married for 20 years with two children. We married young I was 20 and he was 21.
About a year and an half ago he had an affair with a younger married coworker where he works. He didn’t try to hide it and we have stayed together working things out.
When I found out about what was going on I decided to have a fling of my own. He never expected I was doing anything because I was very careful not to see anyone he would suspect..
The guy I’ve been seeing is a younger guy who is a representative for a company that calls on my boss where I work. We only see each other when he’s in town. I meet him for a quick lunch then to the motel where he stays so everything takes place during the day which avoids my husband having in a suspicion. A few weeks ago we had an accident when the condom he was using broke. My husband and I also use condoms for birth control but have not had any accidents. When my period was due I didn’t have it so I took a pregnancy test confirming I was pregnant.
After some thought I told my husband I was pregnant with him immediately asking how that had happened. I told him I knew exactly when and how it happened telling him I wanted to have an abortion. He never questioned anything but I’m sure he knows it was someone else who got me pregnant because he has been very distant since.