In need of advice!!

I have a 3 week old plant grown in soil from seed.The past few days i have been noticing some of the leaves are drooping,slightly yellowing,and black spots are forming on leaves.I'm not sure if i over watered it,or it is a ph problem.I have just been using plain tap water when watering.Began using nutes last week at quater strength.I plan on buying a ph tester tommorrow to test the ph.Basically what i want to know is,are both of these problems reversable?If so,what do you recommend?
I will include some pics to show you what i mean.And yes,my pics aren't the best.
Any help or suggestions appreciated.

in the pictures the soil is way too wet not just from (i just watered ) that looks diff. also get it into a taller container that the roots can spread out and down into soon ,good growing ...rob

aw thundernuts lol. You said you started giving nutes last week ? yes .
Well if thats right then you have started FAR too early , You have nute burn and you need to flush plants ,asap. You also say your ph is out at 6.9 well you could drop that to 6.5 with some ph down , .I would give flush and lay off the nutes for week or 2 and only give plants water that has been sitting in your grow room for 24 hours .

Thanks for the reply guys.I am using a 10 litre pot,and i'm not too sure about the ph.Going to try and pick up a ph tester tommorrow to find out what it is.What ph would you recommend?I've read between 6-7.Does that sound right?I may also pick up some fine dolomite lime to bring it to a neutral 7.

I ph my water and nute mixes to 6.5 for soil. what type of soil are you using

I'm using cil grow organic soil.What do you use to keep it at,or around 6.5?

General Hydroponics ph up/down.

you need too fill your water containers up let sit in room for 24 hour to let chlorine evaporate ,Then you need to ph water , add nutes , shake well wait 10 mins then ph water again and then adjust accordinly with ph up and ph down , can be a chew on to get right but aim for 6.5 as ive mentioned earlier . Let water run out bottom of pots then ph that run off water and then that will give you the true run off of the soil

So i just went out and bought 2 ph testers today.One for soil,and one for liquid.Checked my water,nute solution,and my soil(3 times for soil).It's not a digital reader(more of a probe),but each time it said it was roughly 6.5-6.8.Which leads me to think that my problem isn't ph related.I'm now back to thinking it was over watered.I gave it a really good watering the other day(just water to dilute nutes i gave it),so maybe that is what is causing the blotches.I will post some more pics in a few days to show how she's doing.May also turn thread into a grow journal to help anyone going through the same problems as me.

So i think i made it past the seedling stage(3 weeks).Lots of new growth in the past few days.I plan on vegging it until the end of may,then flower for 9 weeks.Does 2 months from seed sound to long/short for veg(2-3 for seedling,5-6 for veg)?
Also,my problem leafs(pic above) each has 1 blade that is about 1/3 dead.What should i do about them.I'm thinking of just cutting off the damaged blade itself and leaving the rest of the leaf be.It hasn't spread anywhere else on the leaf,and i don't really want to start cutting it up so soon.Does that sound right?Or should i just leave it be and let it do it's own thing?
New pics coming soon.

Longer veg=bigger buds. Also you can just cut that one leaf off. or do what you said and cut off the damaged parts.

So it's been awhile,but planty is doing/looking pretty good.Today it is 5 weeks old(from seed).All the discoloring is gone from the leaves,is about 9 inches tall,and all green(well so far at least)!I am also pretty sure she is a she.Noticed a few pairs of white pistils today around the top of the plant that weren't there last night.Does this seem to early to start showing sex?Most books i've read say it usually takes about 4-6 weeks of veg to start showing sex.And planty is only 5 weeks old total.I still plan on vegging for another 2-3 weeks(she needs to fill out more),than flower for 9 weeks.Does anyone know roughly how much a plant stretches during flowering?I now it depends on alot of things(strain,lights,growing conditions,etc..),but just a rough estimate.I am growing big bang if that helps any?
Once i pick up some batteries i will post some new pics of planty.

around 6 weeks starts showing sex in my experience with seeds since moved onto clones and they started to turn yellow transplanted to bigger pots and that seems to be working and your plant will grow fast when you first change to 12/12 can grow upto 3 times the size