you're pregnant! DING! firstly congrats and secondly sometimes cats can feed off your hormones and 'nesting' aka worrying about things more than usual. It could get worse or better when you have the baby. but it will settle with time. Some cats can get really aggressive and loud seeking attention when there is a new baby in the house. Some don't care... but most of the ones I've known with friends and clients all go a bit mad lol. We found Feliway and lots of extra attention for the cat when you can treats, new posh foods and toys can manage for a little while. just spoil them a bit also make sure your litter box is in a nice private place.

good luck!!