what type of chips do you crave? as i will let you on a little healthy chip secret.... own made in oven, fry lite! cut up spuds n part boil them for 5 mins, dry off, put on oven tray and spray with fry lite... roast and done! you can even add garlic salt on them etc if you fancy flavouring them. salt n vinegar on them is reaaaally nice too, lol.
but i wouldnt worry about your weight gain... yes if you put on 3 stone in that time maybe worry.. but not something that is baby weight, water and everything else that body fat stores for making breast milk. xxx
relax and enjoy your cravings!