hmm
if your sticking to your points, how much 0 point food are you having? and are you correctly working out your AP?? As everyone else has said , if you post afew days worth of food diary here( ones where you perhaps had alot of bread or chocolates) we might be able to have a look at where you are at.
I have found previously on old ww plan that if i was eating bread and pasta for more than one meal everyday i would store loads of water due to carbs holding on to water in your body.
Also i have found that many WW dont use their Earned AP unless they have done serious amounts of exercise. I dont use them as only exercise i get is walking my dog.
Are you constipated?, due your period??? lots of different factors can be cause of a gain. but the plan works so if you continue following it correctly you will lose eventually