constant shivers up the spine when trying to sleep

28 weeks today!!

im gonna talk to my doc about this at my next appt (as well as multiple other things), but recently when im actively trying to get to sleep i will have constant chills up my spine every few minutes for hours. i didnt get to sleep until after 1:30 last night because i kept doing the “shiver”. its not shivers, im not shaking as if im cold. its the chill you get up your spine every once and awhile but its every few minutes for hours. im pretty much jerking my whole body when this happens. i just wanna know if anyone else has experienced this, or what you guys think that could be? im gonna take my anxiety medicine before bed tonight to see if that will possibly do anything. im really at a loss 🫠😭.