M.S.
Hi chauna,great job breast feeding your baby and it is safe to take plan B as it is the same hormone progesterone that you are taking in mini-pills.It is most effective in preventing pregnancy if taken ASAP but you have up to 4 days post unprotective sex.When you restart your next cycle of mini-pills use condom for one week as a backup just to be safer.........good luck and please don't hesitate to contact me if you have more questions regarding EC/plan B.