Did I introduce the paci too early?

I'm hoping someone can help me out here. I have a 2.5 week old who is very fussy at night. She will cry for 5 hours at a time. I think she just gets herself worn out and the only thing that seems to help is comfort nursing. However, I'm at my wits end so 2 days ago I started giving her a pacifier to see if it helps her calm down. It did, but now today she is super sleepy and I can't get her to feed as well. Did I screw up my baby?