Underwear

Ok so I'm trying to figure out this problem... I've never had too many issues with underwear being uncomfortable or bunching up down there. But lately it's been SO annoying. Like I feel like my underwear keeps bunching up by my vagina and it's super irritating because I have to keep pulling at it all day. And it doesn't matter what kind of pants I wear it keeps happening... I don't know if underwear it just getting annoying or maybe I need to go down a size? I just recently started losing some inches/weight so maybe it's just size? I don't know... anyone else ever have this problem?