Butt down ok now
"breech" position at 27 weeks is not concerning---baby can be in any prosition at this time--likely will turn near birth time.
Regarding being low and uncomfortable....You may try maternity belt which may help a bit. Avoid tight clothing. Lay on you side to rest when you can. If these measures don't help, consult your doc for further eval.
Good luck and congrats..Babies are awesome!