Breech presentation at 30 weeks

Mga momsh, at 21 weeks, breech si baby ko, nung 24th, cephalic, then yesterday at 30th week, breech po ulit. Bakit po kaya ganun? Any tips po to maintain baby's position sa cephalic po? First time mom here. Medyo worried lang din po. Praying for a normal delivery po sana.? Please send your thoughts mga mommys. God bless.