Pam, you are so very welcome!
I don't think so. Generally when the potting medium sits and gets a fungus, the seedlings suffer from something called 'damping off'. That's when the seedlings just flop over and rot where the stem meets the soil or the roots rot. Sometimes you will see mold growing on top of the soil.
I have another question, I used the Jiffy seed stater. I mixed the dirt in a bucket with water to dampen the soil, when I transplanted the seedlings into the 4 inch pots. The soil that I had left over I just sat aside, and when I started potting again about a week later I went back to that soil.
With It setting for a long period of time damp, could that have messed up my soil and caused some of this problem ??
If you aren't going to use all the dampened growing medium, it might be best to stir what's left in the bucket a couple of times a day, or spread the medium out on something like a cookie sheet to dry.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.