Valtrex while breast feeding ?

I put a call into my doc and have been reading online , just curious if anyone has experience taking valtrex or the generic form  while breastfeeding ? It seems to be safe from all I've read and I'm sure my doc would of warned me about this if it was an issue but I'm still concerned , my son is 3 weeks and I EBF. Wondering if it's affected anyone's supply ? TIA