Ooh bagus lah mummy think of vitamins early! Honestly masa I pregnant dulu, I just stick dengan prenatal vitamins yang doctor prescribe je sebab sure-sure safe, a few of my mum friends jugak prefer yang route untuk peace of mind. Vitamin C memang good for immunity, tapi better check with your doc first pasal dosage dan brand apa yang ok during pregnancy, even though most orange-flavored ones are fine la, some prenatal brands do include C anyway so might sudah cukup na. Kalau really nak the orange flavor, any reputable pharmacy should have safe options, just tanya the pharmacist or your OB-GYN which brand they'd recommend specifically for 15 weeks. Congrats on your pregnancy!