I skimmed the general area of relevant pre- words in OED, but saw nothing suitable. I'd go for...
As you anticipatively mentioned...
(OED anticipatively: By way of anticipation.)
In most contexts, doing something anticipatively would normally be understood to imply doing it deliberately (with conscious knowledge of a relationship between what you're doing now and what you expect later). There might be a more "passive" equivalent term (i.e. - without those "volitional" implications), but I can't think of one. If it was important to avoid the unwanted connotations, I'd probably use more words: "As you unconsciously anticipated [when you mentioned blah blah]".