to everything said already. If it's happening as often as it sounds, try adding some PB to an apple, or have a handful of nuts. An ounce of nuts is 4 points, and they aren't exactly filling - they'll help you get your intake up to where it ought to be without feeling stuffed.
A lot of people, myself included, had this problem when starting WW. The diet mentality is that if we're not starving all day, it's not going to work. We're only going to lose weight by depriving ourselves of food - and lots of it. This is generally what experience has taught us, but WW works on the opposite principle - we HAVE to eat to keep our engines running!