Seen the doctor, aren't GPs useless with pregnancy?! He had a feel of my tummy and checked my pulse and blood pressure, everything normal and no pain.
But has managed to book me an early scan on Thursday, which is great news. My NT scan is at 12 weeks, and I didn't really want to wait another 2 weeks worrying that there would be something wrong. So all being well (and I feel like all is well) we'll just get a sneak preview of our bean! 
I did have the same thing again when I pushed a poo (so sorry for the TMI) out this afternoon too, so I think it's definitely related to my bowel issues. He's also given me something to sort that out with, so all good.
It does mean I've had to tell my boss though as scan is in the middle of the day on Thursday...he's a bit worried that he knows before my mum though! 