Alah, ramai je mummy friends yang tanya benda ni masa pregnant, terutama kalau dah lama amalan sebelum hamil! Apple cider vinegar dalam small amounts okay je, tapi sebab you're worried and it's your first baby, better check dengan doctor ka midwife you dulu, they'll know your blood pressure readings and can advise based on your specific situation, safer that way. Congrats on 12 weeks!