Hi! I haven't personally gone to Sta Ana Hospital kaya hindi ako sure sa exact process nila, but a few of my mum friends who delivered there said you really need to call ahead para sa OB appointments, mas safe na may slot ka na ready instead of waiting forever if you walk in, lalo na ngayon na busy sila. Best thing to do is tawagan mo directly ang hospital or check their website para sa exact schedule ng OBs nila, kasi bawat hospital may different setup talaga! Hope it goes well sa check-up mo!