Good morning ladies!

Since about 18 wks I've had what I think is Braxton Hicks. Off and on tightening but only at certain times of the day, mostly at the end of work or before bed. I'm 21 weeks now and yesterday it happened on the way home from work in the car. I drink a ton of water and still work out in the morning so I just wanted to make sure this is normal? There is no pain with it at all, it's just uncomfortable sometimes. I usually rub or pat it and it goes away. When did you ladies start having this?
Also sometimes it looks like a little ball on the right or left side, I thought it might be the baby but it's tight.

Hope everyone has a great day!