Braxton Hicks

Braxton Hicks at 17+3?! So I was in line at McDonalds and my baby was moving around like crazy, like a lot! Then when I got home I went to use the restroom and right when I finished peeing i cramped up really hardcore and my whole stomach became really hard. This happened twice lasting 15-20 seconds each time. Is this normal!?! I didnt think this happened until later on!