33 weeks pregnant with lower abdominal cramping?

I am 33 weeks pregnant and having some lower abdominal cramping. It is under my belly kind of where my pubic area is. It comes and goes. I dont think it is contractions. Is it possible that he is just head down and adding pressure. Its worse when I stand or sit, laying down is fine. This is my 2nd pregnancy which is why i dont think it might be contractions.