I'm not sure about the difference in foetal movement, but the icky tummy feelings could be about the uterus moving higher and squashing up your tum. I know as mine has gotten bigger, my tum gets really upset (nausea, indigestion, heartburn and feeling "squahsed"). Then it seems to kind of get used to it and be ok for a few days and then as the uterus moves higher it gets worse again....grrr!!