newborn sleep at night *update*

so my baby girl will be 3 weeks on Thursday, she has been doing a lot of cluster feeding. she started super early last night

after her last feeding last night she fell asleep on my chest and I fell asleep from pure exhaustion with her on my chest, before you all start telling me how I shouldn't sleep with her on me that's not what this post is about and I sleep on the couch right now so I don't move I don't roll and she don't go anywhere either... anyways back to my issue lol, she ended up sleeping for almost 6 hours, should I have woken her up or is it ok to let her sleep that long? I have had one lady at WIC tell me is she sleeps through the night there's something wrong and my breastfeeding consultant at WIC tell me it's ok to let them sleep

*update*

so she didn't cluster feel last night but she still slept for 5.5 hours, am I just worrying too much or is that a bit long, I just worry being a ftm cause I have no clue what I'm doing and I want the best for my daughter