Hello, Thanks for letting us know your health concern. If you are lactating, you have to take the medication in between and preferably, soon after giving a feed to lessen the activity on the baby. In spite of this precaution, since the medication contains high dose of progesterone and has a prolonged half-life, the baby is liable to be influenced. Instead, you can ask your health care provider if you can go for the insertion of an IUD as an emergency contraceptive, since you are already six months post-operative. Hope this information is helpful. Wish you good health.