That's how mine started. I went to try to nap and couldn't sleep with the tightness, and then noticeable contractions started a few hours later.

Yes that’s how I felt but no pain went in and contractions were 1 minute apart

That's how my labor was with ds2 until I gave birth. I didn't have any painful contractions just uncomfortable tightness.

Possibly, but you could also be dehydrated from being sick. Like pp said, get some fluids in you either way. If you're starting labor it will become apparent before long.

That's how mine started. Just ride it out and see if it gets worse, if it starts getting worse, consistent, or painful then start timing them. I didn't have real pain until I went to the hospital though and I was a 7 when I got there.

In the meantime I'd go take a shower, drink some water and have a snack. You'll know if it's go time.