Ok sooo definitely newbie learning curve here! I have made a couple mistakes that I hope will not turn disastrous. First off all the articles I read did not specify to use a pencil to mark the eggs... I used a sharpie. Also my diy incubator has proved near impossible to keep a steady reading and has fluctuated anywhere from 93 to 106, according to my thermometer, but mostly has stayed in the 99-102 range. I bought a real incubator from tractor supply the day before, a basic still air. Feeling much more confident but still worried. Probably a silly question but where exactly should I place the temp gauge? It seems like it varies widely in the reading by barely moving it. I know it's a little early (I started them on the night of the 10) but I couldn't contain myself any longer and candled them this morning. Some are blobs, others look like they might have the beginning forms of veins, and three others have distinct circles.
I think you will be fine, I'm a newbie and made a lot of mistakes but all my ducklings (9) look fine in their shells!

If I remember right, I do not think sharpie is a problem. Take a look at the below thread.
https://www.backyardchickens.com/th...with-sharpie-answer-is-yes-with-proof.630135/
The temp gauge should be placed half-way up the eggs to get an accurate reading, since in a still air their will be different pockets of heat. Sometimes my thermometer slipped to the top and would read 114, giving me a mini panic attack

Good luck!
EDIT: Temp should be measured half-way up the eggs and not at the top. Don't think it'd make much difference but just wanted to clarify

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