Am I having contractions?

How far along are you?

What you're experiencing sounds more like Braxton-Hicks contractions, which are basically your body practicing for ordeal labor. They feel like a tightening in your belly, but they will stop if you walk around or change position, and they do not get closer together. Usually they are not even regular enough to time. 

Real contractions feel different. My Braxton-Hicks contractions made it difficult to breathe, like the tightening went from my belly to my chest. i could breathe through real contractions, they didn't stop just because I was walking, and they were painful. When I went into labor with my son, I woke up feeling like I had a huge cramp, only the pain was sharper than a regular cramp. The same thing happened with my third baby. 

Trust me, you'll know the difference. BH contractions can happen for quite a while before you go into labor, mine started Barbour two weeks before my babies were born, but my mom had them for 6 months.