I think you should be thankful!!
I've had a 'normal' sleeper, in the sense that she isn't terrible like I read in these forums sometimes (never able to do more than 3 hours since birth, for example!, but also not AMAZING like 8 hours at 6 weeks
If she's gaining weight, and seems alert and happy and developing normally, you are just the luckiest gal in the world.
For the first 2 weeks she slept 3 hour stretches, then she started doing 4, then gradually up to 5, and a few times we got 6 hour stretches (I'm talking week 3 and 4 here), then from around week 6 to week 8, the fussiness during the day hit its peak, and her sleep got COMPLETELY messed up. She would resist naps like there's no tomorrow and would wake up literally every hour after her first stretch of sleep (which never last more than than 3 hours).
From week 8 to now (she is almost 12 weeks), it became linear with a few blips, first 5 hour stretches, a few times 6, then 6h30, and then last night I got 7h44mn for the FIRST time!!
One this that I started doing differently is spacing out her feeds during the day a bit more (the nurse told me to fed on demand when we left the hospital, which I took very at heart, and have been feeding on demand since. However it's my first and I was clueless so I basically fed her everytime she was crying (she rejected the dummy for the first 2 months of her life), which could be every hour (quick feeds of 5mn though).
Now I'm spacing them out to at least 2 hours, which she struggles to reach sometimes, 2,5hrs if I can make it.
I also started to give her a bottle of expressed milk AFTER I fed her in the evening. So she'll drink from both my breasts, but I don't think she's giving it her all, so then we proceed with the rest of the routine, and finish with a bottle right before e put her down. BOY that worked like a charm and she slept ALMOST 8 hours last night.
Of course I didn't sleep all that time as my body obviously decides to wake me up at 4am, since it's been used to doing that since the 17th of July 😓