Eh, ni memang normal la at 27 weeks, uterus dah besar, tekanan kat bawah ada, so rasa kembang or heavy feeling tu common. Frequent peeing pun same, baby dah push kat bladder kau. One of my mum friends kata sama je experience dia, especially kalau duduk lama atau bangun from resting position. Tapi kalau ada vaginal discharge yang strange colour atau bau, atau bleeding, or feeling really uncomfortable sgt, better check with your doc just to be sure everything okay, bukan apa, just peace of mind lah, especially at 27 weeks ni.