Due date

Ano pong mas accurate na due date for first time moms? Hindi ko na matandaan exact date ng last menstruation ko pero ang tanda ko 3rd week of October last year! 1st Utz (TransV) - July 29, 2020 2nd Utz (Pelvic) - July 26, 2020 3rd Utz (BPS) - August 01, 2020