Miracle Grow Potting Soil

I'm on my first grow and in the 3rd week and I am using MG. Everything has been going great until this morning I noticed some yellowing beginning on a few of my plants with a few brown spots. From what I have been reading, it is likely nutrient overkill with the MG soil. Any suggestions on how to correct this problem, I haven't picked up a pH tester, going to tomorrow, but any ideas would be helpful. thanx
 
I got the nutes issue under control, I had to transplant into pots with FoxFarms soil, went light on the water and everything is balancing out now. I also trimmed a few of the fan leaves that were badly damaged and all my babies are returning to a dark healthy green now! 4 weeks old and about 8 inches tall, I will be back with more updates!
 
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