Just took a pregnancy test and it's positive! Yay! Should I start prenatal vitamins and folic acid? Where to buy? how much? When should I go to the Dr? By my calculation I must be in week 4 right now.

Congratulations! You can purchase folic acid from any pharmacy in Singapore. It is okay to start taking folic acid even without a doctor's approval. You can visit a gynae around week 6 or 8 to confirm the presence of a sac and fetus through ultrasound.