Aww, sounds like baby girl is definitely getting into position na! The heaviness and pain you're feeling down there is likely her head engaged na, which is a really good sign na she's preparing, a lot of us mums experienced the same thing weeks before labor, kaya it could mean anytime from now, but honestly, first babies especially can take their sweet time pa rin haha. Since your cervix is still closed but softening, I'd say just enjoy the last few weeks, stay comfortable, at follow your OB's advice closely because every pregnancy is different, best to chat with her about the timeline at what signs to watch out for!