Breech Presentation

I did my ultrasound as what my midwife suggested because I don't know what month baby is... My period is irregular that's the reason I don't know what month exactly my baby, now, I have known that my baby is 4 months old and it is stated in the result that the position of my baby is in Breech Presentation she explain to me what it is all about. I worried now if the position of my baby won't change what thing should I do??