34 weeks with contractions

Katie
I had a slight pain in my belly and had called my ob she said i should go to labor and delivery just in case. When i got there they said i was having contractions 3 to 4 mins apart.. I didnt feel the contractions at all!! Im only 34 weeks so that made me nervous because i dont want him to come too early! They took my urine for a tox screen and to check to see if i had a uti... No uti & never said anything about my tox screen(which i wasnt worried about anyways) but then the dr came in and checked me & my cervix was still closed and i wasnt dilated at all so he sent me home.... He said just because im not dilated now doesnt mean things cant change in the next few weeks... Anybody else have an experience like this & how long after did you actually deliver? Just curious