Ay hirap talaga ang weekend OB hunting, lalo na first time! A few of us mums from the area actually ask around sa hospitals first, like St. Luke's GMA or Makati Medical, kasi sila usually may OBs na available on weekends, and you can request specifically para sa schedule mo. Try din calling their OB department directly kasi some private practitioners may weekend slots but hindi laging advertised, so you really have to ask. Good luck, mama!