Feeling a fluttering twitch sensation without anything in. Anyone else experience this?

I’ve been using the aneros on and off for a few years but pretty often this year. I would say at least once a week. I’ve been noticing that I now get this kind of PC/anal twitch or quiver without anything in now. It’s not a strong clench but it’s a few seconds of fluttering that pulls my focus towards it. I think it’s more common (or maybe I just notice it more) when I’m aroused or have abstained from orgasm.

It happens completely unprompted and on its own. It’s not painful but also not pleasurable, like a muscle twitch. Is this normal or has anyone had a similar experience to this? Should I follow this feeing or try triggering more by contracting my muscles when this occurs? It’s usually pretty pleasurable in a session when I do that. I’ve heard of people getting sensations outside of sessions so I’m wondering if that’s what’s happening or if it’s a sign I should go to a doctor.

I’m worried because I got into the habit of using a much harder PC contraction with the aneros earlier into the year. I thought I was getting better results with that, and actually thought I had an orgasm or two. I’m not so sure about that now, but the sensation definitely started after this. I think I might have been mixing up the feeling of strongly contracting my PC muscles with having an orgasm, since it feels really good and similar after a long session! Like if I hold a strong contraction now at any time it genuinely feels almost orgasmic. On another positive note I’ve gained **much** better control of the muscles down there, like amazing control I never even considered before. Maybe I’m just more aware of my prostate or muscles now? I can’t tell if it’s a sign of arousal, fatigue, or damage so has anyone else had similar out of session sensations?