I, personally, would stop if I had a child growing and depending on me for life. It's just that I look at the child as not asking to be here so why put the added stress of providing on your body and the innocent life inside you? Pregnancy is already stressful enough and to add the thought of a dangerous client, a bad session due to hormonal embalances, the stress of having your business suffer after a bad review, the doctor visits, the leg cramps, the weight gain, the sore boobs, the nausea, the upset stomachs, heartburn, the crying spells, getting the baby's necessities together, planning on everything...I would think NOT. Maybe work the first three months while you're not showing, but nothing after three months. I know I personally couldn't stand the pressure of my child's father on my stomach at 5 months and on, so why would I want to have mutiple gent's day after day, different weights and masses on me that I didn't know?
Just my opinion.