Repeat Newborn Screening?

My baby was born at 35-36 weeks. He's 16 days old today. I received a text today to claim his newborn screening result and for repeat newborn screening 28 days after birth. Should I worry po ba na pinapaulit ang newborn screening nya? I don't know the results yet. First time mommy here. And may moms din po ba dito na pinanganak ang baby nila at 35-36 weeks or what they called late preterm? Pinag 2nd newborn screening din po ba ang baby nyo?