16 weeks and contractions

This is my 5th pregnancy so I’m well aware of everything pregnancy lol. I’ve been having contractions all morning and I’ve honestly never experienced it this early. It’s not too bad... well I’m not sure cuz my tolerance for pain is high and the only time contractions hurt was with my first pregnancy. I definitely can feel it that’s for sure. Has anyone else felt this around this time? I’m not going to lie, I’m probably dehydrated because I had a long day yesterday and basically didn’t really eat or drink well and was sleep majority of the day but I’m just confused as to why I feel it so early smh