Sayang, any chest pain during pregnancy should be checked by your doctor or go to the nearest clinic/hospital just to be safe, okay? Better to rule things out properly than worry at home.
Gastrik and pregnancy discomfort can feel quite similar sometimes, but only a doctor can tell for sure, it could be so many things, from the way baby is growing to how your body is changing. Since you don't have other symptoms like spotting or discharge, that's a good sign, but please don't delay getting it checked out, ya. You're doing great by being careful about your health!