If one asks his freind “is today the 8th day of the omer?” is he yotzei counting? can he still count again with a bracha?
It is not considered as if the person has counted yet and the person may still count with a bracha. The reason is because the person did not mean to count, rather to verify which day it is in order to count afterwards. Therefore it is no worse than a person who said that tonight is this and this night but had in mind specifically not to count. He may still count with a bracha.
Ksf Hachayim 469-61, Maharsham 269-4, Kovetz Halachos (Sefiras Haomer) 5-10.