most of the evidence for bleeding problems happens on the medications -- not after discontinuing them. my best guess is that the antidepressants are not the direct effect of the after-menses spotting. if you are also using birth control pills traveling across time zones can make pills late/early which contributes to spotting. a new sexual partner can initiate chlamydia which causes spotting. if the spotting persists i would see your gyn for follow up.
can antidepressants cause spotting?