weight issues

I'm 5ft 8.5 ins I just stood on the scales I'm 14st 8lb now I'm 7 weeks pregnant and I was weighing 14st 2lb that means I have almost gained half a stone in matter if weeks....is this ok or should I be worried I'm scared I'm gonna balloon up why would I put that much weight on already. update I do eat veg n fruit n not much rubbish but also u don't each much that's why I'm surprised