Should i still take the medicine?

Meghan • TTC our rainbow🌈 after stillbirth at 37 weeks 5 days

So my friend gave me her bottle of metformin to take (to help with my pcos) , and I’ve been so scared to take them since i wasn’t prescribed them. I was supposed to take them today but before i did i was reading up on it and they said that the FDA now says to not take metformin because the high cases of it causing heart failure... what should i do? Should i take it or no?