I think this could go one of two ways.

If you are attracted to women but not to men, you might think "in the moment" and conclude that your orientation has changed and you are now homosexual.

Or... You could see it as a "bigger picture" thing and either call yourself bisexual because you have in your lifetime experienced sexual attraction to both (and might have the potential to do so again), or consider that if this change occurs several times that even though you might not experience sexual attraction to both sexes at once, you have at some times experienced sexual attraction to both, which might be said to be a kind of bisexuality.