What is your Washer Brand:
Hi! "amyswasher" is your Washer a Top-Load or Front-Load? Are the Spots light or darker in color? I would think if they were light color, then they might be from the Fabric Softener Sheets. If they are darker, then it might be something wrong with the Washer.
I haven't used Fabric Softener Sheets in a long time now, I prefer to use the Liquid Softener, besides it gets dispensed Automatically, in my LG Compact Combo. You might try using the Liquid Softener for a little while to see if you are still getting similar Spots on your Laundry. If you aren't, then it might be your Washer, if the Spots are not still on your Laundry, then it might have been the Fabric Softener Sheets.
If the Washer is new enough, I would recommend having a Repair Tech come out to check it out, to see what's wrong and hopefully remedy that problem for you, if it is the Washer.
Peace and Kind Regards, Steve
SactoTeddyBear0503...