Advice please

Okay so I don't need telling how stupid I am 💀💀

My husband and I have three children, our littlest is almost one so we were not TTC. I was switching birth controls as the pill was no longer working for me and had an appointment to have an iud fitted. My husband knew that I wasn't on contraception, we did the deed one time and I'm pregnant. Now my feeling is that we were both adults who know how sex/pregnancy works. Obviously we were taking a chance to get pregnant when we used no birth control, granted I wasn't expecting that one time to do the trick. Husband is annoyed, says that I have to get an abortion. Basically insinuating that I tricked him into pregnancy, I cannot believe this is the man I married. I am pro choice but could never see myself having an abortion it would wreck me. Any advice please?