I've always felt bloated and such on my period. But, today I weighed myself and I gained 2 pounds.. this is weird because I've been dieting and exercising for a month (lost 7 pounds thus far). I haven't given in to sweets, junk, pasta, bread, ect. So the only thing I can think of is my period made me gain.
It's completely normal :) when I weighed myself once when I was on my period I was shocked to see that I had gained 3 lbs! Bur I looked through the internet and found that menstruation does make you gain weight, because of the water retention, bloating, etc. don't worry, you're going to lose it when your period's over, that's how it went for me :)