I think it was around 5 months with my first but as I was PG over winter I was wearing more clothes so people didn't notice. I stopped working at 32 weeks and popped in for a visit 2 days before I was gave birth and my bosses eyes nearly popped out of his head. I also saw a few regular customers thet day and they said they had no idea I was PG. I saw these people almost every day, although I was standing behind a counter.