Baby bump

So posted not to long ago about just finding out at 6mo that I am pregnant. I am coming to terms with it and am getting a little excited. I do however do not look pregnant and I was wondering if anyone could tell me how long it took to get the bump. I never had maternity pictures taken with my first two because well I did not look prego with them either I just looked really fat. I would love to set up a shoot with me and my two daughters but I want my belly to look prego is this something that is going to happen or am I going to just keep losing weight and not get the bump I am almost 27 weeks now and still no bump will I get one? Did you get one how far were you before you started to look prego?

 For me.. I had a baby bump but it was more flabby and B shaped than round and beautiful until about 37 weeks.. Then all of a sudden it went perfect beachball shape.