Yes, I believe in reincarnation, but highly doubt I was a human being much of my soul's journey. In Sikhism, it's believed that your soul must journey through 8,400,000 lives before your soul can enter a human body. I could've been a human before, but wouldn't be surprised if this was the 1st time I made it to human form. So, I don't put much into whether or not I was a man or a woman or some other gender, or the male, intersex, or female sex, in a previous life. Souls are genderless, and I suppose I am trans because my soul remembered that it wasn't inherently "man" or "woman" like western society tries to box you into.
Another thing: I don't like the theory some people put out that being trans could be a punishment by God or through any sort of karma system. That form of thinking, I think, is so completely based on the line of thinking that comes from what the white, Christian-based, colonists taught the world to think --- to think that being transgender is a bad thing or a difficulty. In some other cultures, being transgender isn't seen as a bad or unusual thing, it's seen as normal and even celebrated, some see it as a gift from the Creator. The spiritual world doesn't revolve around what white, Western thinking believes is true. Everything in our lives could be either a gift or a punishment, but being trans isn't automatically a punishment just because white, Western society taught you to believe it is.
Ultimately, whether it's a punishment or not doesn't matter to me. At this moment, I've been lucky enough to have come into human form, and it's time to make the best of it now rather than harping on what may or may not have been the past.