Mama, ito talaga ay kailangan i-check ng doctor mo agad, especially during pregnancy, hindi dapat i-ignore ang ganitong concerns. Tachycardia sa baby ay something na kailangan ng proper monitoring at professional assessment, so please don't worry-worry pa muna and just get it checked out ASAP, okay? Your OB will know exactly what's going on at what it means for your little one. Praying for you and baby!