Honest lang, accurate na siya most of the time sa 7 months pero hindi 100% guaranteed, may small chance talaga na maling reading ang tech or baby's position, lalo na kung mahirap makita sa ultrasound. I know ng ilang cases na akala girl pero boy pala yung nabirth, pero honestly hindi super common na, parang 1-2% lang? What matters most is malusog ang baby, pero fair to prepare for either way kung gusto mo ng peace of mind!