What will help me feel better?

I’ve been cosleeping with my son since about a week or so after he was born (he hated his bassinet) he’s 18 weeks now. Cosleeping is also ALOT easier. So today my S/Os boss bought us this beautiful expensive crib & I kinda wanted to take things slow & just have him sleeping in it during the day during his naps so I can watch him you know? But I put him in the crib just to see what would happen (he was already sleeping) & he’s stayed in there asleep since. It’s been about 3 hours but I’m scared to fall asleep because I wont be able to keep an eye on his breathing if he tries to flip on his belly... we got this amazing expensive mattress for his crib it has all of these perks for instance it’s “breathable” saying if he flips on his face he’ll still be able to breath but come on really? Like how would I know it’s true? I could breath into it but my lungs are stronger obviously! Right now he’s sleeping fine. I have a blanket under him because I was just seeing what he looked like in there & he stayed asleep so I didn’t wanna wake him up so I just said fuck it it’s not on top of him & wont be able to be. I just hear all of these horror stories & im worried😞 please someone make me feel better about not cosleeping!😫

Update: He ended up waking up like 3 times & somehow got his foot stuck in the crib bars so he just slept with us the rest of the night.