Sorry to hear. I have 25 eggs in bator from my own chickens and NOTHING yet. Day 23. Probably duds too but waiting a little longer.
Keep the good attitude and try again! Better luck Next time.
It happens when we first got a rooster after a month i tried 10 eggs none were fertile then i waited two more months and had 5 out of 6 eggs fertile and hatched, a year later now i set 20, 3 were duds all from the same ugly hen both roos don't bother her and we are going into lockdown on friday with 17 of 20 eggs not bad i think two roos to 14 girls. it happens just give him a little more time to practice his stud muffin skills