When will my dog start showing

my dog was skinny too til the pups get bigger bout 2 weeks before she delivered is when she got huge but after the pups she was all bone you could see her ribs.some dogs do this it is very normal.With this being her first have you bred or seen a birth before?Ull need a thermometer watch her temp have you been feeding her puppy food if not you need to get her on it right away. If her temp drops below 100 it is getting close. She will loose her mucas plug and fluids like water breaking when fluid turns colors to greenish brown she will have a pup.My dog is a small one she had hers in the night bout 4 days ago first litter with no complications. After pups are born to get fat on her feed her canned food with wet food some yogurt beef with rice or chicken with rice and get her on a vitamin sounds like a lot but if she isnt getting big its because they are takeing her nutrients away so you have to give them back with puppy food as much as she wants daily before and after.Good luck