is my fast broken if i might have had dry sperm

when i woke up my penis was hard i went to eat suhoor but i felt something in my penis so i went to check and there was nothing in my underwear so i went to pee and i noticed white dry tiny things right next to my penis hole (may have been dry sperm, they also disappeared after peeing) so i spent 2 hours searching what it is, then there was 5 mins before fajr so i prayed it thinking because there was nothing in my underwear i was fine but now i’m thinking that the white stuff may have been dry cum does this invalidate the fast?