I'm almost 33 weeks pregnant and for the last few hours I've had some quite bad pains at the bottom of my bump. It almost feels like really really bad trapped wind, or a badly pulled muscle (even though it hurts if I'm not moving). Could this be Braxton hicks? I haven't really got any tightening in my bump, which is what I read that BH feel like, it's more just sharp pains just above my pubic bone. 
Does this warrant a call to MW? I really hate calling her unnecessarily, especially if it is just painful trapped wind!