Does anyone take acyclovir??

My doctor prescribed me this yesterday, I’m exactly 37 weeks pregnant. She gave me a 30 day supply and I’m suppose to take it 2 times a day. I’m worried about not being able to breast feed while on the medication. I also get no more refills (i only have a cold sore) and don’t even get them but once a year. I’m worried that Once i stop taking the medication that i will have another pop up due to no longer taking the medication. Does anybody have any experience with acyclovir in general, we’re you able to breast feed? Did the medication help you?