Thanks everyone for the replies. I feel alot better about it now. I have the angelcare monitor and have used it from birth. Our hospital actually told us not to get them as they give a false sense of security and people tend to become relaxed even when they go off. Each time it has gone off (3 times now cause DD holds her breathe or the plates weren't in the right position) I've run like mad to her side and given her a good poke to get her moving. I mainly got it for the temperature reading in her room as we have a fireplace but I like having the little bit of reassurance.

DD has slept on her tummy today and happy with it. Tonight she has gone down on her side but before her feed she was on her belly. I'm going to see how she goes but feeling a little more relaxed about it.

We have a smoke free home, no stuffed toys in her cot, firm mattress and fitted sheet. Only thing she does do is sometimes works her arms free of her wrap and pulls the wrap on her head, but I am using muslin wraps now which are very thin so doesn't create too much of a suffication problem. Would have been early on when she was being wrapped in a blanket due to the cold.