Your doctor should have given you a time for when to call. Most go by 5-1-1

5min apart, lasting 1 minute each, for 1 hour or more is a good sign you may be in real labor. The contractions also generally increase in intensity, wrap around from the back to your belly, and usually start of mild...have a peak in intensity...then dies back down.

only 10% of women's water break on their own. so that won't be a good indicator.

time them. also your doc should of went over it with you...

You need to count them and hope your water breaks