All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ʻalayhi wa sallam, is His slave and Messenger.
We fear that you may be suffering from some sort of waswaas (obsessive whisperings) in this regard. If so, you should disregard and repel such whisperings and absolutely pay no attention to them. You should know that you bear no sin for such an action as long as you acted out of forgetfulness; the Muslim is not held accountable for actions done in a state of forgetfulness. Allaah, The Exalted, says (what means): {...Our Lord, do not impose blame upon us if we have forgotten or erred...} [Quran 2:286]
It has been reported that Allaah, The Exalted, says in response, "I have done so," as cited by Imaam Muslim .
Allaah also says (what means): {... And there is no blame upon you for that in which you have erred but (only for) what your hearts intended...} [Quran 33:5]
Hence, you should be lenient with yourself and ignore this matter; you bear no sin for it, Allaah willing. You should also know that there is no specific supplication for such a condition. Rather, the Muslim is enjoined to remember his Lord and seek His forgiveness frequently; verily, that yields great rewards.
Allaah knows best.