Salam! Eh, 5kg turun tu memang boleh jadi normal in pregnancy, tapi depends lah, ada some of us yang lost weight early on esp kalau morning sickness teruk or just diet changes, tapi at 27 weeks biasanya dah patut steady gain. Sebaiknya korang check with your doctor to make sure baby okay and it's not gestational diabetes or something else, sebab kita nak pastikan everything fine for both of you! Jangan worry sangat, but definitely worth asking your gynae at the next visit.