Salmonella in eggs comes from an infected flock (or often from kids kissing on the infected chickens or handling them and not washing their hands).. Buying your chicks from and NPIP source such as hatcheries (and most feed stores are middle men) can
help prevent this.
https://www.aphis.usda.gov/aphis/ou...ide/poultry/national-poultry-improvement-plan
I've been raising backyard chickens, sometimes in high numbers for 10+ years without washing eggs (dirty ones are washed and fed back to the animals) or a single incident from anyone in my circle caused by eating my eggs or chickens. Of course everyone's mileage may vary.
It was actually a commercial outbreak and recall of Salmonella that convinced me to take things into my own hands and start keeping chickens (for eggs) in the first place. NO regrets! Though there is nothing cheaper about it.
I suggest fried with a SLIGHTLY runny yellow!
New layer hiccups can cause all kinds of things like double yolks or no yolk, no shell, etc. And commercial eggs are highly candled to remove any "blood/meat" spots (their sent to cake batters, commercial foods, etc). Some birds are more prone than others, but don't panic if you do see something.. A decent article to review..
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/
Congrats on your first eggs!
FWIW.. I bet you could have your birds tested.. if you're really concerned.