Sounds like they may be the start
/labor for you. What instructions did your doctor give you for checking in? Usually contractions lasting for so long, so far apart, regular, etc...
Have they stopped now? If your doc didn't give you instructions, I would call (tonight if they come back) first thing in the morning to find out what you need to do.
I'll be asking my doc when I see him next since it's been so long since I had my last little one.