Hi Kate,
Not sure if this will help but I've been getting brazilians for years and continued to do so when I was TTC. Most of my appointments were around the time of ovulation (just because it worked that way - not because it was planned!!!)
I've never heard anything to suggest you should wait. And I figure that anything that makes BD'ing more fun (especially when you're doing it so much) can't be a bad thing!!!
Good luck!!!
Lily