Uneasy feeling

34.3 weeks pregnant today. Last Wednesday I went into L&D; for constant cramping. They hooked me up to the monitors and it showed I was having contractions every 3-4 minutes. I was sent home because I wasn't effaced or dilated at all, but told to come back if it gets worse. Hasn't let up, but hasn't gotten worse, either. I just have this nagging uneasy feeling tonight. Has anyone else experienced this? Should I go back in just for peace of mind, or is this just the exhaustion of being in constant pain talking? I don't want to be a bother or sound crazy.