Do I need a monitor?

The closer I get to delivering the more anxious I feel that I need a monitor like the owlet/something similar. It’s just they’re all so expensive and apart of me doesn’t want it to make me incredibly paranoid. We have an arms reach sleeper so she will be literally right next to me so that makes me feel better and as if maybe that’ll be enough? I just can’t drop 300 dollars on something that may cause more anxiety then peace of mind and all of the other ones I’ve seen have so many mixed reviews on if they really work. 😞