I would definitely go back or at least call your doctor
Hmm most hospitals won't let you leave if you're dilated at 4cm. I would go back and just have them check your cervix one more time.
My contractions have been ten mins apart since I was at the hospital have not changed
Wow, I can't believe they sent you home too. Sounds like if it was two nights ago you obviously were not in active labour. How are your contractions now? Are you heading back?