6 week old slept 11 hours straight

🐘🐘🐘 • 👧🏼 born 1/19/16. 👼🏼 lost 9/15/17. 👼🏼 lost 11/26/17.
I exclusively breastfeed my daughter. We also bed share. She barely slept yesterday, only one or two one hour naps and then short 10 minute naps throughout the day. At night she started up one of her usual colic episodes around 9:30. I gave her a long bath which seemed to soothe her, but she freaked out when it was over.  I walked/rocked/sang around the house with her for about an hour and she ended up falling asleep around 12:00 AM. We went to bed around 1:00. I offered her a breast every time she was stirring in her sleep (she ate 4 times that I can remember). I woke up at 11am and was SUPRISED that she wasn't awake and waiting for me as usual. She fed for about 10 minutes and then I changed her diaper which woke her up, but she has just fallen asleep again an hour later. Should I be worried?!