Each pregnancy is different and each women feels their baby move at differing times. Usually, anywhere between 15 up until your early twenty weeks.
As for the doppler, I seriously advise to try perhaps at 12 weeks but do not be alarmed if you cannot detect it. Often the baby is small, moving around a lot and/or your own heartbeat can overpower it. I would say normally around the 14 to 15 week mark is best as the heartbeat is much stronger.
