15 month old baby biting

my son is 15 months old and has been biting nearly every nursing session for the past few days. we nurse before bed, once overnight, once in the morning and once during the day if i’m home (otherwise i pump at work). he went through a month or two of biting when he was younger but he seemed to outgrow it and has been fine for months until now. last night he bit so hard i was crying 😢 is this a sign he’s ready to wean?? i know my supply has decreased since we’ve dropped nursing/ pumping sessions so idk if he’s frustrated with low supply, maybe just bored, or teething (he does have lower molars coming through)