Labour signs ?

Has anyone else felt jittery and shaky before they went into labour ? I’m currently 35.5 weeks and today I feel very spaced out like I’ve just woken up, and randomly have the shakes in my hands, arms and legs ? I have been eating like I normally would so didn’t think it was my bloody sugars ? Any suggestions would be great cuz I’m worrying a little 😩😩 other than that I feel fine so am a little stumped