Sakit bawah perut ngilu-ngilu ni memang biasa dalam trimester ketiga, tapi sebab first baby kamu pun normal lah nak worry, a few of my mum friends had the same thing around that time and it was just the baby dropping dan ligaments stretching. The nausea boleh jadi from the pressure, hormones, or just how the baby's positioned, tapi kalau sakit meluas, bleeding, or you feel something's really off, better check with your doc jadi lah untuk peace of mind, especially untuk first pregnancy.