I didn't say Bhima is Madri's child, I am saying Balaram not recognizing them and Pandavas not going to Krishna for help can not be a criteria to decide whether they met before or not because Pandavas didn't contact anyone, not even Salya and Kauravas failed to recognize them
Krishna recognized them
I started doubting this only because @HearMeRoar had said in a conversation that Draupadi's name was Krishna and Krishna was Vasudev or Govinda's physical description, If I have to introduce myself, I will tell my name and last name
"I am Krishna" is not enough for me to recognize someone I have never met in my life