Ooh sayang, at 16 weeks ada rasa sakit kat rahim tu mmg normal sebab uterus expand, tapi kalau ada sakit kat paha pulak especially one-sided mcm tu, better check dengan doctor kat next appointment ke atau call clinic just to be safe, a few of us mum friends experienced round ligament pain during pregnancy which boleh terasa kat pelvic area and thigh juga, tapi sometimes it could be something else yang kena monitor. Jangan worry sangat, tapi jangan delay juga lah, especially if sakit tu getting worse or ada cramping yang strong, better peace of mind kan. Pregnant body mmg banyak stretching happening, but any new aches mmg worth getting checked out.