What's peoples thoughts on booking pregnant WG's
It is one of those things to tick off the bucket list; like sex on period and anal.
Like others have pointed out finding one can be super difficult and you might have to be flexible to travel. I have been lucky enough to do some pregnant ones, sadly they no longer working, and also in my civilian life with pregnant women/wg, some tips:
They might be extremely self-conscious and find positions difficult particularly during later stages, Google "sex positions in pregnancy" for tips.
If thinking about RO, probably be discharge which is different than non-pregnant times, just be prepared for the different taste and feel etc. The risk of thrush is higher in the pussy when they are knocked-up, so you might want to abstain from RO, and trust me if she says no RO do not push the issue!
Breast's can be very tender so be extremely gentle.
Lastly they can be super emotional but it is very rewarding time you feel very special doing a pregnant WG - or maybe I'm a perverted so and so!