Hi mama! Honestly, 22 weeks pa lang medyo maaga para sa best results ng 3D/4D, most OBs recommend waiting until 26-28 weeks onwards kasi mas clear na ang baby's features at features na and mas maraming amniotic fluid pa para sa better images. A few of us tried early and ang dating parang blurry lang talaga, so we went back ulit later and super worth it na! Consult your OB muna kung saan sila mas comfortable mag-refer, basta ready ka na rin financially kasi kinda pricey, hehe.