Pregnant Wife

Early 80s I was 22. A couple lived 3 doors away in my apartment building. They were friendly, we had coffee together a few times at my place or their's. Sometimes all 3 of us, sometimes just us guys, a couple of times just me and her.
One day they tell me she's pregnant and they were happy. I congratulated them but I really didn't care. All good.
Couple of weeks later she knocked on my door for coffee, no big deal, usually we'd visit for 15 min then she'd leave. This day she told me how horny she was since getting pregnant, I was thinking WTF ? We ended up in my bed getting it on twice. I was deathly afraid her hubby would find out.
It became an ongoing thing. I fucked her 3 or 4 times a week. Usually in the morning after hubby left for work. She'd knock on my door around 7:45 telling my they had sex twice but she was still very horny. I was getting his seconds but she was very into the sex. There was times we'd get it on in the afternoon before he got home.
I think she was maybe 3 months(?) when we started, she didn't look pregnant. We hooked up till she was big, 8 months(?). Her pregnant body wasn't attractive to me but she'd fuck me silly. She gave birth and they moved shortly after.