But yes, I do agree MO being pregnant is unlikely.
My great grandmother had her 13th child at age 49. Her husband died shortly afterwards so that was the end of that. Her daughter had a “surprise” pregnancy (my Dad) at age 50. Stranger things do occur; however, this was during the time period when birth control was limited. The same gossip about a White House baby floated around when Bill and Hillary occupied it. Not cred IMHO.