Or at least very attractive.  I don't discriminate against pregnant providers, I think it's actually kind of hot.  Looks are important, so I suppose if she is good looking and someone I would see before she got knocked up then I would definitely see her while she is carrying.  

My hooker wife of many years saw customers up through the seventh month with both of our sons.  She became super horny while carrying both sons -- that was in extension of the fact she was horny always. She actually increase her hourly a little bit and advertised she was pregnant.  Tips seemed to increase a bit also, with some saying "a little extra for the baby" or similar.

I love to nurse with lactating ladies, titty fuck and BBBJ.  So yes! So few available.

But the one time I did session with a pregnant provider (she didn't tell me in advance) I was happy to realize that I couldn't  get her pregnant (again) when the cover slipped off just BEFORE I finished. And she told me she was so horny she came when she realized I'd just nutted raw inside her.  Go figure... and no, will not repeat.  

Pregnant prostitutes are only hot if they are willing to be seeded.  Otherwise it is a big bore.  

Doesn't do anything for me, I would pass.

Check out Phexxi birth control. Hormone free (no hormone jokes please.) You apply it before sex, good for one hour.

I wouldn't but i did once without my knowledge. She was 3 months pregnant at the time. Later found out at a subsequent date that she was pregnant. didn't notice the bulge at the time.

and they we're horny as hell!

I do not think I would purposefully seek one out, but if a woman who I had seen previously was working while pregnant, or I saw someone that looked really hot pregnant (I remember years ago, this pregnant woman came into where I was working at the time, and me and 2 other guys agreed that she was hot), I would go for it.