Blackbird nest

Was cutting back an out of control bamboo bush and have accidentally exposed a nest with chicks in it.  I’m pretty sure it is a blackbird nest as I can see one hanging around nearby.  I feel awful for exposing the nest and I’m worried now the parent birds won’t go back to it.  The nest is still covered at the back, sides and at the top but it now exposed at the front. Should I try and put some branches back or am I best to just leave it now? Are the parent birds likely to abandon it now? I know it was stupid to cut the bush back without thoroughly checking first but the nest was deep in the bush.