With tomorrow as hatch date - I wouldn't bother candling them. The big blob is probably the chick. It will either hatch within the next couple of days - or not. After Day 25 I usually candle to see if there is any movement or growth - but by that point it's usually over. If there is a big blob in it and you can't see much else on Day 21 then that's a good sign.
Okay, hands off until Tuesday!
The best way to learn for newbies is get a white grocery store (not Trader Joe organic) egg and candle it - see how clear it is on the inside - that egg is infertile - no chick will hatch from it. Then to check your eggs to see if fertile after you put them under the hen for 7 days - take them out and quickly candle in a dark area. If there is anything inside it that is dark - good chance that's a chick growing. If they weren't fertile they will still be practically clear like a grocery store egg. Don't waste time looking earlier as you might miss it or think it isn't growing when it is.
Great advice! I'm going to do this.
Then on Day 14 candle again and sniff them to see if any rotten or bigger growth - you will see a bigger blob if they are growing. If they're bad they will be about the same size as before, however I don't toss them until after Day 25 or if they are cracked/crushed or stink. Some chicks grow at a slower pace - so don't assume they're bad just because it's Day 14 and they don't appear as big as the one next to them.
I haven't noticed any smells or cracks. Will wait for Day 25 before I do anything.
I would not bother to candle any other time. Unless you have white eggs and can clearly see through them and want to see the stages of growth - which is pretty cool. The broody will toss out bad ones and she will smoosh bad ones a well.
Just listen in a little while and you may hear peeps coming from under her. But don't pick her up or move her as she's busy regulating the humidity and temps - like a bator does.
I will let her do her thing!