Ahhh sayang, 19 minggu tu memang boleh rasa perut mengeras dari time to time, kebanyakan mummies I know experience tu jugak, it's usually just Braxton-Hicks contractions or your uterus stretching lah. Tapi sebab ni pregnancy concern, better safe than sorry, do call your doctor or midwife just to confirm everything's good, especially kalau disertai dengan bleeding, spotting, atau pain yang teruk ye Rest properly and drink lots of water, tau!