It was a misunderstanding because she thought since I ordered more Heartgard, he hadn't gotten the dose for January.
Then she picked it up and I said "Don't get him one! I already gave him one this month" and she went "Um...I just did..."
Sigh. I'll call the vet tomorrow and let you know what they say!!
and Rachel: yes, my mom takes great care of my little baby
He even sleeps in her bed at night!!