Soil Help

Ok so im renting a house and in the back seemed like some miracle grow soil in a flower box. I cant make it to any stores to get seed soil so i ended up sprouting my seeds and using that. Yes, i used backyard soil. Im not sure if that was a smart move, and if i could correct that somehow, but it must not be that bad. marijuana has grown for thousands of years in it, truly all natural. SO, how deep am in it or can i dig myself out? (BTW soil had visible perlite chunks and it was nice and dark soil)

it'll be fine, but transplant to individual containers as soon as they are an inch high or so, so their roots don't mingle, and make separating them a bugger.