I'm on day 12 and have experienced some of that too.
I think part of what causes it in me is a reaction to the senna in the laxative tea. I make this assumption because I have used senna in the past on other cleanses and I had a similar experience with it. The other potential cause could just be detox of intestinal toxins - especialy if you've got old stuff packed in there. I'd suggest if you tended toward constipation before MC, this could be the case. Detoxing is just wild and woolly, isn't it? Peace out.