if the cyst
is shrinking in size you can wait for some more time, surgery is needed only if have pain or infection of the cyst.
however since you are only 13 weeks you can wait for some more time as most elective surgeries are carried out in preganancyin second trimester.
if the cyst does not shrink with time you can have it removed during your post partum period.
avoid surgery during your pregnancy
unless it is indicated.
i hope i have answered your query.