I have put on about five kilos more with my second pregnancy, and I was actually a few kilos lighter at the beginning than I was with my first preg. But my extra weight is from being a stay at home mum with a frustrating toddler and "medicating" myself with chocolate whereas with the first preg I was at work and far less stressed!

From a health point of view if you are unhealthy (but it doesnt sound like you are) now then maybe losing a little bit of weight before getting pregnant might make things easier and may avoid complications, but I agree with Nickle if it's from an appearance POV kick him in the shins!