FWIW, this is our 7th pg, and really the only one where she's been willing (not wanting, just willing for the most part). The previous ones, her already low desire went to no desire. My favorite line is whenever she thought she might be pregnant (including a number of false alarms), it was an immediate "you're cut off until I get a pg test and know fer sure". What's up with that? If she is pg, then there's nuttin to worry about (see,there's the nuts again HP, LOL). If she's not, then it ain't any different than the week before she thought she was....
HP, when the baby comes, make sure you and H schedule plenty of down time for yourselves. Don't forget, you both will need it (as if I had to tell you that).