Braxton Hicks?

For the last two weeks I've been experiencing an occasional tight feeling on my stomach and it's harder to the touch, but the feeling goes away after a minute or so. At first I thought it was just the baby curled up in one spot but someone told me it could be braxton hicks. I'm 23 weeks and I'm a FTM so I don't know what's normal. Is it too early to get Braxton Hicks? I've been drinking lots of water and I haven't been on my feet too much today, and my son is moving around like he normally does. It just feels like a tightness or like there's a ball under the skin, but it's not my entire uterus, it's just one spot, normally on the right side of my lower abdomen.