What do braxton hicks feel like?

So I wanna know from other Mama’s experiences. What Braxton Hicks feel like??. Are they period cramp-wise?. What do they feel? How long do they last?. I have been having contractions. They come every about 5 minutes. It lasts for about 30 seconds. And I’m only 35 weeks pregnant. I’m not too sure if it’s time or what’s going on. I’m headed to the hospital now to find out. But if the baby isn’t coming yet. Are they just Braxton Hicks?. How do I prepare myself for this? They started after me, and my significant other had intercourse.