The World Federation One Stop Fiqh

Ritual 317

If a doubt arises towards the end of, or during, the round, between three and four, five or six, or any other form of shortage, the tawaf is invalidated, even if the doubt was between six and seven rounds, as a matter of precaution.

The same rule applies is in respect of a greater or lesser number of rounds, like whether the last round is the sixth, the seventh, or the eighth.