Braxton Hicks vs real contractions

I’m a FTM. I am just really confused. I have read what both are and what they feel like, but then again I don’t know what I’m having. I have had a lot of cramping (which I believe are BH) then since I have had a membrane sweep last week I have had some tightening in my abdomen (middle of my stomach) and in my lower left pelvic area, then they go away. Are those BH or real contractions? I just assume it’s the baby pressing against me, but it’s not. Right now I feel tightening in my abdomen along with a little pain in my pelvic area. Any ideas?