tmi- idk if this is chaffing or if it’s something else

Today I was wearing leggings all day from 7am-10pm. I just thought like my thighs was rubbing together and that’s why it hurts to walk but it’s in between my butt cheeks that’s hurting. It’s red and bumpy. Never seen this before. We

Last week when I wore these leggings ( same pair of leggings just different colors for days , I would realize my thighs hurt but I just thought bc it’s my thighs rubbing together and the frabic is pretty thin. )

Would these be cause the chaffing or is this something else ? Could it be bc I haven’t really trimmed or shaved there and hair is over grown ? I have been slacking in that department since I got pregnant.