this may be a little tmi... but butt pain? 21 weeks!

GUYS. I'm not sure if this is relevant to my pregnancy or if I'm just a weirdo, but I've noticed lately I can be laying down, standing up, sitting down, doesn't matter- and I get these horrible sharp pains in my butt! Usually accompanied soon after by gas. Is this normal? It woke me up in my sleep about 4 times last night and is super uncomfortable, but nothing unbearable. Does this happen to anyone else and does anyone know why? 😩