I am a vet tech and I worked up until 25 weeks....just watch lifting and do your best to not get kicked or head butted. I also bathed and did kennel work, so you should be fine. Just wash up well after handling cats.
Congrats!! Drink plenty of water, rest when your body demands it, eat rather healthy and take your prenatal vitamins. STAY AWAY from flea dips if you indeed are around them. Most places no longer do them ,but just incase you do, DONT.
You can still work. Pregnancy is no reason to stop your life. Glad everything looks good!