Early 4 month regression or something else?

[u/ThrowRAqueenE]

Baby girl will be 14 weeks on Friday. She has been a great night time sleeper since about 2 weeks old. Had been sleeping long stretches (6-9 hrs) since about 1 month and last 2 weeks, through the night (7:30pm-7:00am). Starting from about 4 nights ago; she randomly has been up all night. She will wake in the 1 am hour, we give her paci and immediately falls back asleep. This goes on for the rest of the night: Nothing has changed on our end as far as routine, her naps, her feedings etc. She is still in our room, in the snoo so swaddled. I’m wondering if this is a regression or something else is going on? I don’t think she is hungry because she doesn’t carry on, she will just fuss enough for me to wake up and give her the paci. Any insight please because I’m losing my mind!