SHERRY: Well, Christopher and I didn’t exactly plan for this to happen. I thought I had the flu or something. When I finally went to the doctor and he told me, he had to pick me up off the floor.
Christopher told Lorelai that Sherry announced her pregnancy to him over the phone at Sookie’s wedding. That was on a Sunday, so she can’t have been to the doctor that day. Sherry later says she waited some time before telling Christopher she was pregnant. Christopher’s story that Sherry had only just discovered she was pregnant when she phoned him turns out not to be true after all.
The Annotated Gilmore Girls 