When will my dog start showing

I have a dog about 4-5 wks pregnant and she not showing and she just starting to eat more than she was I guess she had the sickness that they get and this is her first pregnancy I think she is preg she mated 3x and I can feel about 2 pups in her belly...

and her nipples are getting bigger too can anyone answer my question about why is she still skinny

I BELIEVE ITS 6 WEEKS OR 8 BUT ARENT THEY ONLY PREGGO FOR TWO MON ANY WAY

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