I don't know if there is an unlucky sign tbh but my sign can be unlucky. I have hurt myself mais times than I can remember. I literally talked with a girl whose 3 days after me in February (Aquarius) and she has had alot of the same shit happen to her and it was unlucky. To the point we even consider ourselves black gatos to a point half-jokingly.
But for the most part even tho it feels like your sign is unlucky every sign has their own share of bad luck.