Braxton Hicks or Round Ligament?

Today I've been getting these dull achy cramps in my lower stomach and sides. Could they be BH contractions or round ligament? I experienced round ligament a lot in the earlier weeks but they were always intense sharp pains that lasted a minute or so and subsided and would only happen when I moved suddenly or coughed/sneezed. This pain is achy cramps and lingers. It goes away while im sitting or laying down but as soon as I get up and start moving around, it's back again. I'll be 26 weeks on Monday. Just curious if any of you ladies have experienced this, if it was normal, or I should call my OB. I have an appointment on Wednesday and do plan on bringing it up then.