the baby bloat is serious!!!

I am 5 weeks today this is my third baby so I know women show faster when they have more children, but I've gained 7lbs in the last two weeks and idk why. I generally eat healthy no fast food and no junk or snacks. I do eat a lot of carbs though like pasta and bread. I just don't get where this belly is coming from. With my last pregnancy I didn't even show until 24 weeks. Please tell me I'm not alone!! I'm so scared of gaining too much weight and being unhealthy or developing gestational diabetes. Is anyone in the same boat as me?  Has anyone found anything to help with bloating?