When a hen mates with a rooster, she keeps a packet of sperm in her egg tract which fertilizes every egg she develops for about 10 days. If she mates regularly, her eggs are fertile regularly.
The blastoderm is the little white ring on the surface in the egg yolk and holds the hen's DNA. When an egg is fertilized, that ring looks like a bullseye of 2 rings as the sperm DNA surrounds the hen's.
Magically it remains in stasis in that state until it is heated to about 102 degrees for 24 hours. Then and only then does an embryo begin to develop.
So remove eggs daily so they don't start developing. You'll have to be attentive as Silkies are notorious for wanting to brood, which means sit on an egg for 24 hours plus 20 days to hatch chicks.
Fertile eggs look and taste the same as non fertile except for a little tiny extra ring in the egg yolk.
If you find a fertile egg under a hen after several days, you will see blood vessels developing which can create a yuk factor but the egg is still safe to eat.
Bottom line...just regularly gather eggs once a day.
BTW You can find crow collars at My Pet Chicken as well as
Amazon. They work really well after you've fiddled a couple of days to get it right enough but not too tight. You also need to regularly check to make sure all is well. I've used them successfully for many years.
LofMc