don't feel too bad 2 of mine with clear tips day 18 hatched, it takes longer- just be more patient. and 1-2 days on your hatch day- I have eggs in my bater day 21 with clears but veins- I will just wait and see.
I have all 21 with clear tips, some are about 90% filled some about 2/3 full... I went ahead and took them out of the turner last night when I candled but now wondering if I should have left them in if they are so far behind.. I know there was a poster here that said she had some hatch 6 days late and I truly hope that's the case, and ok, I wont go into lockdown until there is an external pip.