IM currently 36 weeks 2days this is my second pregnancy. Yesterday I lost my mucus plug and I'm having contractions but I can't tell when they start or stop cause it's a dull achey feeling all the time moving doesn't ease them, drinking water doesn't either, laying down doesn't help either I went a week ago to the hospital they said I was in preterm labor but I wasn't dialating any so they sent me home.so what should I do?

Call your Doctor and ask him/her! Now!