Pressure in pelvis?

Hello! I'm 24 weeks along and since 3 days I've been experiencing some pressure on my pelvis when I walk around. My baby moves around and occasionally kicks but I dunno this pressure is a bit weird and uncomfortable... What might be the reason? Should I be worried? My doctor says that as long as it doesn't hurt you it's ok but it's a bit bothersome... Please advice :) thank you!