Ultrasound

I'm 29weeks pregnant and my last ultrasound was made when I was 20weeks palang. Should I request for another ultrasound or BPS sa OB ko or wait ko nalang na irequire nya? Gusto ko kasi malaman position or kung sakto lang ba weight ni baby. Should I request for a 3D ultrasound? #1stimemom #firstbaby #1stpregnnt #1stbaby