Hihi girl, yan talaga ang pinaka-tricky part ng ultrasound! Honestly, kung hindi clearly visible ang genitals during the scan, mahirap mag-confirm ng 100%, sometimes ang babies ay positioned in a way na hindi makikita ng malinaw, or pa-early pa lang. A few of us tried asking for follow-up ultrasounds around 20 weeks when it's clearer, or you can always ask your OB to take another look next time just to be sure. Wala kang mawawalan by confirming ulit, lalo na kung gusto mo talaga mag-plan for boy things na!