Syempre possible po, basta nagsex. Use of contraception only lowers the chances. Also, at 5 months post-partum, it's too early to say na established na ang menstrual cycle nyo. Better to monitor your period for at least 6 months para maconfirm ang regular cycle nyo. Magtake na lang po kayo ng PT for your peace of mind. And just be more careful next time ☺️