Hi, Englishrose.
I can't offer medical advice, so I'm going to encourage you to call your OB tomorrow to see if you should come in to get checked. There's no harm in being cautious.

Also, that was the feeling I had when I went into preterm labor with my daughter. (It wasn't until I called my OB that I even considered that it was preterm labor.) Even though heading to your MFM's office is challenging because of the drive, I think it will help to ease your mind. Are you closer to the hospital where the MFM has privileges rather than the office? Perhaps you could go there for a quick check. Of course, if you have ANY preterm labor symptoms (see below) call right away, or just head to the hospital. Positive thoughts coming your way!!! Fingers crossed for you.
* Four or more contractions in one hour, either with or without pain
* Cramping that may feel like menstrual cramps
* Vaginal or rectal pressure; a feeling like the baby could just “fall out”
* Increased discharge; loss of the mucus plug
* Lower backache that may persist, or come and go
* Bleeding of any sort or amount
* Leaking fluid; a gush of fluid
* Increased bowel movements or diarrhea
* A decrease in the baby’s activity; fewer kicks
* A sense that something just isn’t right