Went to the hospital last night with regular contractions about 2-3 min apart. Then after 4 hours…

Went to the hospital last night with regular contractions about 2-3 min apart. Then after 4 hours and was sent home only 1 cm dilated and the contractions haven't stopped. It's just a bummer that nothing has changed and I'm still having these contractions they want me to go back when my water breaks or they intensify but I have no idea if I'll be able to tell that they have.