All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
You have to ignore this feeling and not pay any attention to it.
You should know that ablution is not invalidated except with a firm certainty – a certainty upon which you can swear – that you have discharged something.
Since you are not certain that you have passed wind, then do not pay any attention to it and just ignore it.
You should ignore all these whispers, because giving in to them will lead you to a great evil.
For more benefit on whispers, please refer to Fatawa 374308 and 356689.
For more benefit on whispers about impurity, please refer to Fatawa 394171, 386950 and 386812.
For more benefit on whispers about purity and how to treat them, please refer to Fatawa 92050 and 92641.
Allah knows best.