I HATE "that time of the month" because I, too, gain 8-10 pounds. It's SO depressing! I think the dreaded Aunt Flo will come visit next week, so I'm going to try to lose all I can this week as to not be utterly depressed when the rag's 10 pounds take effect.
Water retention... I've found that my weight can fluctuate as much as 5-8 pounds throughout one day, depending how much sodium I've eaten and such. I'm 163 now, naked in the morning, and stay 163 throughout most of the day, though in the evening, I can be as much as 168-170. I don't sweat it, though - IF for any reason, I wake up in the middle of the night to use the restroom, I'm back down to 163. And yes, yes, I need to stop obsessively weighing myself.
ItsAboutTime: like everyone else said, after your first week or two (usually your first week), your results will be fat loss instead of water.
