I've experienced this too, and I'm nervous about it this month as Ive been doing so well for the first time ever (16 full days keeping at it, despite slips!)
One thing I read that I'm going to try and keep in mind is that we actually burn about 500 calories more per day during this period (ha) of our cycles because of all our bodies are going through. This explains why some of us feel so much hungrier. This means that we can either cut ourselves some slack and enjoy a few healthy snacks to keep us sane without doing any damage (so long as we don't go overboard) OR stick to our plan and exercise and ignore the scale and lose an extra pound (3500 calories) in exchange for a week of bad scale readings.
This knowledge helped cheer me up some