The present symptoms of irregular spotting could be either due to an early pregnancy
or the hormonal
disturbance created by the delayed application of the patch. You can test for pregnancy if it has been more than three weeks after your last cycle through the blood test
as urine pregnancy test may not give you any definite conclusions right away. I would ask you to see a gynecologist for an examination as well to correct if it happens to be a hormonal disturbance or further management if it is a pregnancy. Hope this helps.