M.S.
3 months is about the time my daughter started getting her teeth. She had at least 6 by 5 months, and all of them by 12. So, yes, this could be teething. I recommend Hyland's Teething Pills, these are amazing! And, things to chew on. We never had any luck with any actual chewy toys, but you might. Good luck! It will be hard, but you can do it mom!