Anak, I know it's scary when our babies need repeated tests, I'd be worried too! Pero yan talaga ang best call ng pedia mo para makita if the lungs are getting better, kaya trust that assessment.
Since it's a medical decision your doctor recommended, siya na ang best person to discuss any concerns about safety or timing, just ask her directly kung bakit kailangan ulit after 2 weeks, para peaceful ka na. A few of us mums learned na open communication with the pedia really helps ease the worry! Your baby will be okay, mama.