Thankyou so much for all of your replies - they have eased my mind a lot... and i'm calling the hospital now to see what they say.

I hope she is just a hiccup-y baby, and i'm just over-reacting. Since posting, she has stopped for about 20 minutes.... the first time she's stopped in 2 days! I have an appointment tomorrow with the hospital anyway, and i'll ask then too. I also have my OB appointment on Thursday. He will probably be able to tell me more.

Thankyou again lovely ladies, i really appreciate your help