Hello Doctor I'm 31 Week Pregnent Now . My AFI

Hello doctor I'm 31 week pregnent now . My AFI level is 24.25 but my all blood reports (gst ,pp fasting etc) are normal . In ultrasound (TIFFA) every thing is perfect .my baby is heart rate is 143 .my doc has advised me to take BETNESOL inj 12 mg two dose on a gap 24 hours . My question is that I have read this medicine may hamper the learning and development aspects of the baby in long run if not immediately. And also Betnesol can be taken just 24 hrs before the pre-term labour (if any). Till now there is no sign of any pre-term labour and I am doing really well without having any pain etc.. Thus my ques is why unnecessarily should I take any risk of my child's future if there is no sign of pre-term delivery till now ??