Sleeping a lot

My baby will be 11 weeks tomorrow. she’s been sleeping for the past 2-3 days all day long. she gets fussy and she wants to sleep. She will stay up for about an hour or two at the most for the past few days. sometimes a little more but she sleeps like 6 hours at a time. Yesterday she slept from 6pm to 12am and stayed up til maybe 1 going on 2 and went to sleep after a few minutes. Is this a growth spurt going on? is this normal for a 2 month old? Nothing is out of the ordinary she’s acting regular. She still plays and coos