Got some crazy news today..

Im 27w1d today. been having some weird sharp pains on my left side for the last couple of days.. finally went into l&d to make sure it wasn't anything too serious. They did a swab test, & it came back positive... for preterm labor! Freaked me all the way out. They monitored me for a while.. Since my cervix was closed & i wasn't having contractions, they sent me home... My obgyn says to take it easy, & if I feel anything out of the ordinary to go back to l&d. he said he will keep a close eye on me.. still a little freaked out though.. anyone else been through something familiar?