How do I know how many of my hens are actually laying?

[Jezahu]

I have 8 hens (7 red star and 1 white something) and they are about 19-20 weeks old. We found our first eggs last Saturday and so far it's gone like this:
Saturday - 5
Sunday - 0
Monday - 3
Tuesday - 3
Wednesday - 5
Thursday - 3 (so far)

How do I know which ones are actually laying? There are 3 with larger combs and another one was sitting next to the box with the eggs today making quite a racket and putting feathers, leaves and hay on her back but she wasn't sitting on anything.

All of the eggs are found 2-3 together in only two spots one is in a nesting box and the other spot is on the ground next to it.

 

[WalkingOnSunshine]

That's a difficult thing to know. Here is information from the University of Minnesota:

Determining Present Laying Conditions​

It is relatively easy to determine whether or not a hen is in production. Check the condition of the comb, pubic bones, abdomen, and vent. If a hen is laying, her comb and wattles should be large, red, soft, and waxy; the pubic bones should be flexible and wide apart; the abdomen should be full, soft, and pliable; and the vent should be large, moist, and free of pigment. A good layer should have more than two fingers spread between the pubic bones and three or more fingers spread between the pubic bones and the tip of the keel.
When a hen is out of production, her comb and wattles may be small, pale, and shriveled; the pubic bones are rigid and close together; the abdomen is hard and tight; and the vent is small, dry, and pigmented. Do not confuse a fatty abdomen with one that is soft and pliable due to laying condition.

When I really want to know what a hen is laying, I'll put her and another hen or two that lay different colors of eggs into a separate pen. I put at least two into the pen so they don't freak out because they are alone. That way, I can tell exactly what she's laying. You can also build trap nests that catch the hens in the nests each day when they go in to lay. Here's one type; Google will give you more. http://www.themodernhomestead.us/article/trap+nests.html

 

[Jezahu]

Thanks for the info!