Confused...

My AF is due today but nothing going on except, nausea, mild bloating, headaches, the common stuff that happens when your about to come on your period, or your pregnant. I took a hpt and it was BFN. But off and on for the last few days I feel "flutters". My husband tells me that if I am pregnant I shouldn't be able to feel anything, the baby is too small. So if I'm not prego, what am I feeling?