teething at 3 months?

Leah
My 12 week old has been eating her hands the past couple days, drooling a lot, sleeping like 20-30 min naps and nursing for like 5-3 min. Then screams. Sometimes I would pump for a few min then feed her and she'd feed for like 20-30 min. Not sure if this is part of teething. Anyone else experiencing anything similar? Seems like my LO is teething.