I've been having weird cramps on my left side, but I'm not sure if my stomach felt tightened or hard if that makes any sense. It definitely felt different than movement. My dog had surgery yesterday, so I've been stressed and maybe that's it. But, I read Braxton Hicks usually start around 20w, and I'm 20w1d. I'm trying to make sure I'm hydrated. So, when did they start for you, and did you ever get concerned?