Sweetpeajan
I bought one off Ebay. My DH was also worried it would worry me more. And he was right. Unlike Danni - I couldn't find the heartbeat with mine - although I could see the display which told me what the HB was. Needless to say I freaked out completely and I've never used it again. My ob uses one on me every visit and now the baby is moving I don't need the reassurance.
It might be a good idea to hire before you buy just in case you are as clutzy as I am with using it.