I wouldn't check them too often for the first few days in case the mother gets upset - I don't think this was a planned breeding, so you didn't have time to make sure your doe trusts you and that she was suitable to be bred etc. If she is still feeding them then don't worry if she takes short breaks from them. Mine tend to stay in the nest a lot of the time but then I usually have two (or more) does to look after the babies so there's always someone with them. When it's just one doe she'll inevitably have to leave them at some point!