Hi! Para sa rubella test lang, hindi mo kailangang mag-fasting, pwede kang kumain at uminom ng tubig normally bago ang lab, kaya relax lang! A few of us here did the test while pregnant din, and walang special prep needed aside from bringing your ID at insurance card. If you're worried, best to call your clinic directly para malaman mo exactly kung anong oras mo dapat dating, pero most likely straightforward lang yan. Good luck sa test, mommy!