Breastfeeding

hi guys, this is gonna be a dumb question but is for the health of my baby, on wednesday i was on the hospital with a terrible pain on my gallbladder (i have stones) and by 8:29 pm they inject me morphine and told me no to breastfeed my baby in 48 hours, and this is the dumb question, i have to count the hours the same night and the 48 hours should be this Friday night? I’m sorry but i don’t want nothing to happen to my baby