Contractions or baby’s movements?

I’ve noticed that sometimes, it feels as if my stomach is tightening. Thing is, I’ve dealt with Braxton Hicks before, yet I can’t tell if it’s the same tightness, or the baby pushing herself against my stomach then moving away. It’s been happening the past few days. Is there any clear way to tell?? My stomach does get hard, but again, I’m not sure if it’s the baby against it or what. I’m 39 weeks

Edit: I only had Braxton Hicks when I was about 5 months, which is why I’m unable to tell. I don’t fully remember what they feel like, and the baby is much bigger now