Hazel,
Same thing here. I was still puking and could feel some movements even after I miscarriaged. Doc said just gas and HCG level not fallen back to normal range.
I don't mean to e a spoilsport, but seriously don't think we are able to feel baby's heartbeat or hear baby's heart beat yet. If can, then no need for doppler or the gynae's machine liao. And i would think it's hard to hear and feel, coupled with the mother's own blood flow pumping around, noise in intestines and digestive tract.