Spastic fetal movement?

I am currently 30 weeks 5 days, have had totally normal scans and appointments so far, baby measures perfectly and is very active.. the other day I mentioned to a friend and said isn’t it weird when they move super spastically all the sudden, like almost like a spasm? I wonder what that is! And she said my baby never did that.. of course it stuck with me and today I brought it up to my doctor and he said we’ll I can’t really say what that means, and it’s too early to tell if it’s seizure activity, and asked no more questions… and now I’m way more freaked out. Has anyone else felt that? It’s not like the regular stretches and kicks and it’s only been a few times, for just a few seconds, like a rapid spastic movement… looking up fetal seizures terrified me and I’m wondering why he didn’t seem more concerned if that was even in the realm of possibilities