Lots of John Potters, but few with wife Elizabeth.
Familysearch has John Potter marrying Elizabeth Lake 6 Nov 1762.
I had a look at it.
It is not Elizabeth at all, but 'Lydia' (
)
There is a marriage of a John Potter to an Elizabeth Dewbery 28.8.1768 in Norwich.
Freereg also has this marriage (transcribed), which gives that this John Potter was a 'widower'.
(Thank goodness Freereg also have the other marriage as the bride being called Lydia Lake!)
No other marriages come up in Norfolk for a John Potter and Elizabeth (from 1760 to 1790).
Of course they may have been married in another County, and you should check for that.
There are a few other baptisms between 1768 and your Ann in 1783 to a John Potter with wife Elizabeth.
Some in Norwich itself, which is only about 10 miles to Wymondham.
Without looking at every entry (images not immediately related to the entries on familysearch), it's going to be very difficult to say if these are the same parents or not. And even then you may not be able to tell if no place of residence is given.
You should also check for any burials for children to John and Elizabeth.
Added: Ancestry seem to have more Norfolk images.
