False Alarms?

Anyone else due in August having false alarms? This is baby #2, so it's not like I don't know what it feels like. I've been to the hospital THREE times in the last two weeks with contractions 2-4 mins apart for more than an hour! They monitor me, contractions fizzle out and then they send me home. How many times can this physically happen to someone? Ugh. So frustrated...