Sleep/ Milk Supply

An
So, I know this is probably a good problem to have, but I'm a FTM so this still worries me. My sweet baby girl is 5 wks old and for the past 2 nights she's slept between 6-8 hrs straight thru at night. I'm worried that this will decrease my milk supply, but I admit that this sleep has been heavenly for me so ideally I'd like to avoid pumping in the middle of the night if possible (though obviously if it's the best thing for her/my supply I will). 
She nurses 8-10 times during the day and takes a few good naps as well (especially st mid-day). She's awake and a big fussy in the evenings with long feeds interspersed with crying at that time and then when she settles down/ears her fill she's out for the 6-8 hrs. Making 2-5 dirty and 7-10 wet diapers per day. Anyone else have a baby sleep like this at 5 weeks? Am I worried for no reason?