Chest Pain

I woke up by 5am because of chest pain and back pain, I couldn't sleep again because of the pain, then I vommitted, after ko magsumuka, medyo nawala chest pain ko, then nakatulog ulit ako, but pagising ko ulit humahataw na naman chest pain ko. What to do po? 18 weeks & 1 day pregnant. Hindi ko po matiis yung pain, kasi super masakit po talaga. Parang ang lalim ng chest ko. Help me!