How much calcium do you need as pregnant and wish for no pills?

Ok i am not,but i am planing to,yet i feel i have no milk in my breasts,so a little training before,ok so i need calcium but don t want to take pills for it might compromise my body,perhaps latter when the baby is in my belly,the milk might get raw,or sower.Drinking natural cattle milk would do the trick for now not yet pregnant?And when i do get pregnant,how many glasses of milk do i have to drink per day to ensure the baby the milk it needs and for me not to pass out of weakens?Thank you!