BH, cramps, or something else? 33 weeks

I’m having a pain in my lower abdomen, it doesn’t exactly feel like cramps, but in that same area. It’s only when I stand up/walk. If I sit down it immediately feels better. I’ve been having Braxton Hicks, tightening along with cramps here and there for many weeks, but today this is the first time I feel actual pain. It really hurts to the point where I can’t even stand up straight. Anyone know if this is part of Braxton Hicks or if it’s something else? Thanks.