22 weeks with twins & cramping?

Amber

So it started last night I couldn’t get comfortable and my pelvis was killing me anytime I moved. But I do have lots of pelvis pain cus baby A is curled up right in it. But all day I have been having lower cramping that comes and goes. Nothing too intense but definitely noticeable and uncomfortable/painful. Could it be just I’m growing more or should I be worried about preterm laboring? With my other three pregnancy’s which were just single pregnancy’s I have history of preterm laboring and a incompetent cervix so I’m wondering if I should just call the nurse line since it’s a weekend but I hate bugging them on weekends and I don’t want to go in unless I have to.