Is it normal to feel unsure even when things are going well with someone?

I’ve been seeing someone for a bit now and nothing is actually wrong we get along, conversations are easy, and there’s no obvious red flags. But for some reason, I still catch myself overthinking or wondering if something’s missing, even though I can’t really point to what. It’s not anxiety exactly, just this quiet uncertainty in the background.

Curious if this is just part of dating in general or if it’s usually a sign that something deeper isn’t clicking. How do you tell the difference between normal doubts and your gut trying to tell you something?