Could I be experiencing early pregnancy symptoms already?

I'm only 1 dpo and the whole time I was ovulating "according to glow" I've had this weird feeling in my stomach like I can't move to much or to fast. I've also was very constipated. And felt like I had a gas, and lower back ache. Including unable to sleep at night constantly tossing and turning through out the night. Has anyone else experience this? Early on in there pregnancy ?!?