I get that you're each other's half, two peas in a pod, blah blah blah, but think about this: do you ever say, "we have a boner"? No! Do you ever say, "we're gassy today because my girlfriend downed an entire cheesecake, even though she has a pronounced dairy allergy"? Nope! So why do you put yourselves in the plural pronoun whenever you're on the topic of a developing pregnancy?
I think the only time that this sort of mushy collective pluralization is acceptable is if/when you and your significant other become conjoined twins after being exposed to massive quantities of radiation from going camping in Chernobyl for your honeymoon (I don't care how much of a deal you got on the airfare, that's not a good idea ever).
|If you look like this, it's 100% ok to say, "we're pregnant."|