I was 14 weeks when I started working at my current job now, but I worked there before and they liked me and thats why they gave me a job but theres nothing wrong with just trying ur best!
I got a job when I was 28 weeks pregnant and a second job when I hit 31 weeks, with my first. Luckily, this time around I still have the first job that I obtained from my last pregnancy. But no, it isn't too hard. :) Good luck! And Congrats!!!