my girl was mated just over 4 weeks ago, she is showing all the signs of been pregnant but shes gained a fair bit of weight around her belly, the thing is she does not want to exercise , she will go for a walk but not run around , she's eaten well so far but my main worry is , is it because she won't excerise thats made her gain weight or the pregnancy, should i cut back on her food until i find out at 5 weeks if she is pregnant or just feed her normally ,

She should not need an increase in her food intake until the 6th week, by which time you should know if she is pregnant.

I and many others switch them to puppy food as soon as pregnancy confirmed.