Cluster Feeding at 2 Weeks

FTM here and trying to navigate the whole cluster feeding thing. My daughter is 2 weeks old and seems to go through spurts of cluster feeding every other day. We have one day where she stays on schedule and the next she starts off fine, then loses her mind wanting to eat constantly. My milk supply isn't fully in so we are supplementing but trying to cut back; unfortunately, with the cluster feeding it is a bit difficult to actually cut back. I don't know if she just isn't getting enough so we supplement, but then she wants more. I then try nursing her which sometimes helps. I just have no idea if she is actually hungry or if she just wants to suck/using my boob as a pacifier. Any recommendations? Is this normal?