Can someone please explain symptoms of pre term labor?

Shayne • 🌈💙Ezra 3.17.18💙- 💗Salem 10.1.19💗

I’m 29 weeks and having cramps that seem to come in waves. It hurts to stand up or walk. Usually sitting down with my legs up relieves pain but this time it’s not helping. Don’t want to go to hospital if it’s just like normal pain 😫 but I’m not sure 😫😫😫