Sayang, sharp pain on one side tu boleh jadi ligament pain (round ligament pain) yang mmg common masa pregnant, tapi sebab dah sakit since yesterday dan very painful, better you balik jumpa doctor or go to hospital untuk check properly, bukan internet yang boleh confirm apa yang tengah happen with your baby tu. Every pregnancy is different, so even if pregnancy pertama tak ada masalah, kali ini boleh lain; at 19 weeks the baby is growing fast so sometimes the stretching tu memang sakit gila. A few of my mum friends had similar scares and alhamdulillah semua okay, tapi they all got checked again to be sure, so please go lah before it gets worse, take care of yourself okay!