M.S.
That sounds like back labor to me. Does it come and go or just stay? It might not be go to the hospital labor, but it could be your body getting ready. Call your doc to double check with them, its better safe than sorry. I have a feeling they might tell you to come in becuase usually back labor means you are going to want an epidural. I had active back labor for 14 hours, I know how bad it hurts and I'm sorry. In the meantime can your husband push against it for you? counter pressure is the BEST. Call now!
Congrats on your new baby coming soon :)