When should I stop?

I am 32 wks. pregnant with my 3rd baby. I have been working out throughout these whole 32 wks. I've been working out for a long time before I even got pregnant but I was wondering when do you think I should take it easy. This is the first pregnancy that I've worked out with, I don't see my doctor until Monday so just wondering. I do kickboxing, I know I'll probably need to stop soon and just go for walks for the rest of the pregnancy but I saw on A Baby Story, a woman who worked out up until her 9th month. When did you take it easy if you worked out during pregnancy. Thanks!