Possible teething?!

Yousra
My daughter just passed 15 weeks and these past two weeks has been drooling uncontrollably biting her hands shoving her hand down her throat been crankier than usual.. I breast feed but lately have been giving her one bottle of formula here n there. I read it was a phase with the hands to not pay attention n she'll stop but she's just getting worse n sometimes while nibbling her fingers or hands she sounds like she's in pain.. Do you think she can be teething should I take her to the doctor?