Normal lang yan, mama! At 19 weeks marami na kang baby inside kaya mas mabigat ang katawan mo, at ang puso mo mas mabilis na tumitibok para sa dalawa, ganitong side effect talaga ng pregnancy. A few of us mums noticed the same thing around that time, parang kahit papunta lang ng kusina hinihingal na hehe, but it does get better once your body adjusts pa lang. That said, worth mentioning sa OB mo sa next checkup para sure lang, lalo na kung suddenly ang bigat ng hinihingal or may chest pain, better safe than sorry during pregnancy!