Today is my weigh in day. I've been good all week and so was disappointed to see my weight had stayed the same. Later today my period started, could this be the reason for my lack of weight loss? I'd be interested to hear how your period affects your weight loss - I've not been doing SW that long and the last period I had didn't coincide with a weigh in (i have very short periods - just two days long). Thanks in advance for any replies.