The usual way, they had sex when he got back from his trip? 😀
For those of you who don't know this is the standard male response to being told that she is pregnant. "uhh, how'd we do that?"
For some reason it is hardwired into our genetic code to ask this inane question no matter what language, even though we know the answer. For those of you who have kids, ya know what I am talking about, and if you don't have kids wanna buy mine?