Is Facebook listening to my phone conversations?

Earlier this evening, I was on the phone with my mom. She was telling me how my dad's CPAP for his sleep apnea is acting up and he's in the process of getting a new one. Without doing any kind of Google search, or even typing the words "CPAP" or "sleep apnea" in my phone, I get on Facebook a few hours later only to find targeted ads about sleep apnea. Seriously what is going on here?!

ads conversations cpap doing facebook find google google search listening phone privacy process search sleep targeted ads