Concerned 😬

It seems after my first kiddo, i get braxton hicks a lot sooner. With my second i experienced them at/around 16wks...mentioned it to my doctor and they never said anything (i was working at the time as a CNA, so constant sly on my feet running around). With this third pregnancy (im a stay at home mom) I’m 18wks currently and have been experiencing them a lot lately..they don’t last long and they aren’t too painful..it more hurts in my chest when they occur. They happen all day off and on..should i be worried?