Hehe yeah, it is eggciting! It looks like you’ve got the candling down pat

well done. The pics are fuzzy but I can see they all look good for putting under her.
It’s easier if you lay the phone down (I use a nice soft bed in case I drop an egg) with the flashlight facing up and lay the egg on top. Just a tip.
Baby Mama will be laying fertilised eggs sooner rather than later too, but if your placing eggs under the broody hen now then it’s a very bad idea to add more later. Broody will just keep sitting until the new eggs hatch and it could kill both her and the chicks that have already hatched.
The day count starts from the day of incubation, so if you put eggs under her tonight then tomorrow will be day 1.
Day 18 is “lockdown”, whether in the nest or in an incubator. Mama hen probably won’t leave the nest at all during the last 3 days. Day 20 should see the chicks pipping, you may be able to hear them chirping. Day 21 they should hatch. Under no circumstances should you touch the eggs or mama hen from day 18 to hatch unless it’s an emergency.
It may be a good idea to have an incubator and brooder as backup, sometimes first time mothers aren’t very knowledgeable and aren’t up to the task. Even older hens give up on eggs halfway through. You could use a box and a lamp if need be. That’s a lot of information that you’ll need, too much for this thread, but you’re always welcome to ask the community or drop me a message if it comes to that.
You won’t see any development in the egg until it’s incubated, so day 5 is after putting eggs under the hen. On the 18th you’ll see something that looks a bit like a daddy long legs spider when candled, you should see something like on my vid on the 19th. (Assuming you put eggs under her at night, I don’t know what time it is where you are).
And something VERY important to remember. If something goes wrong DON’T give up hope. This won’t be the last time your hen goes broody and she is learning. As long as you have a roo with your girls there WILL be a next time. Be optimistic but prepared for bad news.
If you have any questions we’re here for you.
Good luck at the Dr.s tomorrow and good luck with the hatch.
Cheers mate