Yeah, it's a real thing. Birth Control affect hormones and can mess with your attraction. You can search it up online. Some people that lose attraction to the person their with after they get off birth control

From what I hear birth control can make you attracted to people that are more genetically similar to you for some reason

After you get off birth control you'll be more attracted to people to diverse trait than you

I'm not sure why it happens but you can research it

Might give you some answer