How much have you lost in your 4 weeks? Its really frustrating when the scale doesn't show.
Cant weigh in on the period thing since mine have never been remotely regular, but I think it's commonfor big changes in your body to cause spotting
"For attractive lips, speak words of kindness. For lovely eyes, seek out the good in people. For a slim figure, share your food with the hungry. For beautiful hair, let a child run his fingers through it once a day. For poise, walk with the knowledge you'll never walk alone..."