Braxton hicks at 5 weeks?

Ra

So, I am 5+1 with my third. With my other two I got really bad BH starting around 16 weeks with my first AMD 12 weeks with my second. Well, I am here after workimg all day lying down and feel that very similar BH feeling. Is it possible to have it this ealy? In the past when I would get them I would also have my heart palpitating, and that is what I'm exercising now.