Welcome! I think that as long as you go into things with open eyes and realistic expectations -- in other words, allow a connection or connections with one or both members of a couple to develop naturally without any expectation that you'll love them both equally or that they'll each love you the same, or that it'll be easy to integrate yourself into someone else's established lives -- then being a potential unicorn is just fine.
Its good to hear that things are going so well for you!
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.