Like someone said - leave a piece of clothing out with your 'new smell' on it so they get used to it.

This is way more common than one might think. A trip to the vet and temporary use of something like Feliway might help. Please call the vet anyway.

Here's a quote and a link(good link):

Cat Behavior Around Pregnant Women
MGREEN0218 asks: "Our 2 cats (5 year old sisters from the same litter) have suddenly, within the last couple of months, started fighting with each other. They have always been so calm and nice to each other. That in itself is disturbing, but now one of them is urinating on the floors and countertops. They seem alternate who is the aggressor. We have been told that a change in environment could cause this kind bahavior. My wife is now 8 months pregnant. Does anyone know if cats will sense this?"

Answer: i think its true that cats can sence a female being pregnant because my fiances siames cat his an older cat but we have never had problems with him urinating on my step sons clothing now all of a sudden he just wont stop the other day i cought him urinating on my step son he just goes to the bathroom where ever hes standing and doesnt care whats in the way im 7 months pregnant and he knows it my female cat is also pregnant so i think its a double stress.

http://www.babycenter.com/400_can-pe...nfo%401e699f20