As long as the temp is OK don't stress too much about the humidity early on. You can mark air sacs later on and adjust accordingly. I would try to keep it above 25% but keep in mind the ambient humidity does effect it so it will not always be stable from day to day (your weather will effect the humidity) and then your humidity reader may also be inaccurate. . The actual humidity level is not the key factor (except from day 18 when moisture is important but even then people have different values they go for)- just that they have an appropriate air sac (too large= no room to grow, too small = not enough air to survive on when they pip internally).
This is a good read: https://www.backyardchickens.com/a/hatching-eggs-101
Being day 3 you should see signs of veining to indicate they are developing.
Good luckLet us know how they look when you candle them tonight.
This is so incredibly helpful thank you! I tried candling a few but since they are CCL eggs they are too thick and the eggs too blue or something... I could see some air sacs I believe but I saw no veins just too dark so till day 8 then I'll check again. XD I checked my thermometers max and min... The max was 101.3 at some point and I don't know for how long, such a mess and the lowest humidity was 17 ugh! (But as you said not the key to this so gotta ignore that :x) Now that I'm back I can keep it much more stable hopefully, but hopefully those few days didn't completely ruin my hatch.
I'll definitely check out the read, I'm sure it'll be super helpful! Thank you so much! I knew the whole after 18 to raise it up but all she said was keep it above 25, I thought in Oregon it'd keep it humid in there but guess not! Sorry I sound like such a newbie air head I'll let you guys know again on day 8 the progress unless anything else happens.