I need some help!!!

Hey everyone! I'm 35+4 today and over the last few days I've been having what I think is Braxton Hicks... But I'm not sure... My belly gets tight for like 15-20 seconds every so often (not regular at all), it's usually not painful (it has been a couple times), but the same time sometimes it feels like my little man is stretching out. Sometimes as my tummy loosens back up I feel him wiggle. I'm a first time mom, never been pregnant before so I'm just looking for some advice, or reassurance, or something lol. Is anyone experiencing what I'm feeling? Does anyone know whether these are contractions or not??