Congrats on 34 weeks! Usually ang OB namin ay nag-request ng TVS (transvaginal ultrasound) around 34-36 weeks para ma-check ang cervical length and position ng baby, especially if may risk factors like preterm labor history or if they're monitoring something specific, but honestly, it really depends sa OB mo kasi bawat doctor may sariling protocol. Best to just ask your OB directly sa next appointment para sure, kasi some doctors do it routinely at some lang pag may specific reason.