Wtf do Braxton hicks feel like?

Definitely could be something else, but the last two days I feel like I have a little stomach ache, a tiny bit nauseous (but I can still eat) and then some random cramps in different parts of my stomach, sometimes the top, sometimes the bottom. None of this is painful or unbearable and then it goes away. Just wondering if I’m like, sick? Or if these are the start of BH? 36 weeks on Sunday.