Any subject will help never have this happen before.
Your plant looks healthy. I wouldn’t worry about a few blemishes here and there.
Yeah never had that happen even though I being growing for just 1 year but thanks
You do have alot of weird specks all over that you should scope and make sure that there is no bug issues…
Don’t see any sighns of nutrient overload… 
Yeah, I didn’t think of that. They look like it may just be water spots, but a good idea to check for critters.
Organic growth homemade soil.
She’s auto . What happened if I repot her you think she will survive ?
If she has critters and you transplant , you will just be moving them all to a new home…
Critters and plant…
Check for critters befor transplanting…
I dont think that autos need anything bigger than a 3 gallon pot , definatly no bigger than a 5 gallon…
Just my 2 cents…
Ya , i would get a 30x to 60x scope and see if you have any critters…
Your choice of soil looks like a good home for critters…
No crickets now what. 
Looks like some water/nutrient splash to me, if there are no pests. Anything misting your plants? Make sure to check underside of your leaves, some pests can be hard to spot
What @NorseRow suggested.
If you find critters, then suggest using Capt Jack’s Deadbug. Neem oil is okay during veg, but should be avoided during flowering as it will leave a residue on your flower. Capt Jack’s Deadbug is safe for use during all growth stages.