Should I go to the er?

Since 3 o'clock in the afternoon today I been feeling a lot of cramps lower abdominal all the way to my back and legs and is already like1 in the morning and I'm still feeling them but even much stronger and their 5 mins apart I don't know if I should go to the er or continue staying here at home I'm not bleeding or anything coming out from my vagina just a lot of cramping on and off and getting more intense the pain. 37 weeks.