Phillips, Queen Elizabeth II's granddaughter and a former equestrian world champion, went back to work Tuesday to launch a range of children's equestrian clothing.
The 30-year-old said the couple has a busy live and has to delay the honeymoon.
She said: "We're kind of missing the quiet period where we can catch up and have some sleep."
Phillips, who does not use a royal title, wed Tindall Saturday in a low-key, private ceremony in Edinburgh.
She said she has decided to keep her maiden name for professional and sponsorship purposes, but will be known as Mrs. Tindall in private.
