There's barely enough detail to even make a guess here, let alone suggest a reliable direction - but the best answer even with tons of detail would still be to do what makes you happy.
That said, you might ask yourself what exactly you enjoyed about the other person's male part. Did you enjoy looking at it? Touching it? Watching ne's reaction? Having it in you? If all of them, you might consider reexamining why you're not attracted to men - is it emotional or rational? Unlike most men, sexuality for most women is as much or more about emotion as it is about physical attraction, making the question of homosexuality more vague. You may also have experienced past traumatic events that helped decide your stated preferences, such as rape; if so, hopefully you've gone through therapy for it or at least done a thorough self-examination of the events and yourself, otherwise those events may negatively impact your perception of self.
You might also want to examine how long you've felt the way you do about sex. For many, signs of homosexuality happen early in life; for instance, boys may choose to play with dolls and play house instead of more traditional boyish pursuits, while women may be attracted to more adrenaline based pastimes. Or you may simply feel like a stranger in your own body.
In the end, you're the only one who can decide what you enjoy sexually, much like your most recent partner who decided for nesself that transgender is the best for nerm at this time. Don't let those questions stress you - just be happy with what you choose.