I would mention it too. As Black_Rose has mentioned it could be a sign that you might need to slow down a bit as preterm labour can sneak up on you (as i found out lol!). i too was losing quite a bit of plug and movement would set off a round of BHs etc. but resting would have them at least slow down until one night after a particulary busy day i went into labour at 33w6d. I was put on strict bedrest and stayed that way until i was safe to birth at home (which would also of meant that baby was a healthy gestation).

Take care and worth a phone-call. that way they can record that down for you and remember to check you next time you see them (unless they want you to come in earlier!).