Ortho Evra - originally, my patch change day was wednesday. my patch came loose on friday, does?

Sorry this question has taken so long to answer.
This will depend on how long your patch has been detached for.

This from http://www.drugs.com/pro/ortho-evra.html

"..If the Ortho Evra® patch becomes partially or completely detached and remains detached, insufficient drug delivery occurs.

If a patch is partially or completely detached for less than one day (up to 24 hours), the woman should try to reapply it to the same place or replace it with a new patch immediately. No back-up contraception is needed. The woman's "Patch Change Day" will remain the same.

Expand this post...

If a patch is partially or completely detached more than one day (24 hours or more) OR if the woman is not sure how long the patch has been detached, SHE MAY NOT BE PROTECTED FROM PREGNANCY. She should stop the current contraceptive cycle and start a new cycle immediately by applying a new patch. There is now a new "Day 1" and a new "Patch Change Day." Back-up contraception, such as condoms, spermicide, or diaphragm, must be used for the first week of the new cycle.

A patch should not be re-applied if it is no longer sticky, if it has become stuck to itself or another surface, if it has other material stuck to it or if it has previously become loose or fallen off. If a patch cannot be re-applied, a new patch should be applied immediately. Supplemental adhesives or wraps should not be used to hold the Ortho Evra® patch in place."

Hope this helps.