Thanks for the replies everyone. My doppler turned up and I had a go... I did get very brief moments with a HB on the LCD screen but it came and went so quickly - I did find that I had a reading both sides (left and right) which were different - ranging from 165 to 225 - I don't want to start panicking myself BUT... is 225 far too high and could it be a sign of twins?
Any advice much appreciated!