Can My IPhone Record Me Without My Knowing?

I've noticed that I'll be saying something and then my phone will repeat the last second of what I just said and it's freaking me out. It's been doing this for awhile and I need to know how to stop this. I don't want my phone recording me without my knowledge, am I being paranoid or is my phone recording me? Have any of you guys had this happen? If so how'd you stop it?

That sometimes happens with calls. Not with just iPhones. Something of a consequence of telephone systems even today.

No your iPhone is not recording what you are saying.