Just be aware, most bag seeds are the result of hermaphroditic plants, meaning seeds produced this way, carry a dominant gene for being hermaphrodites themselves.
Bag seeds are also "regular" seeds, not feminized, so they have a 50-50 chance of being either male or female.
If you have limited space or a limited number of plants that you can legally grow, growing genuine feminized seeds from a reputable breeder (Sweet Seeds are awesome!) may be a better way to go. If you are keen on experimenting, sure, keep this seedling, but personally this seedling would hardly inspire me if this is all that is happening after 10 days.
Are you watering the whole pot?
I saw some "advice" in your diary saying to only water a very limited area near the plant, which is complete rubbish.
You need to water deep and wide, so that the whole pot is moist, otherwise your plants' roots will not grow properly. They will not grow into dry soil obviously, that is why you need to water deep and wide, to encourage the roots to grow deep and wide. This may also be why your seedling is so small, if you have only been watering in a restricted fashion. Once your plant gets going, watering to run off, so that water is coming out of the bottom of the pot is important. Firstly, it ensures the soil is moist from top to bottom, which is where the roots will/should be and secondly, it will help prevent nutrient salts from building up to toxic levels in the soil. Watering deeply every few days is far better than watering small amounts often, as doing so only encourages the plant to have a weak and shallow root system. Waiting until the top inch or so has dried out before watering deeply again is the way to go and can vary from one day to ten or more, depending on soil type, plant size and temps.
Covering the pot with a plate to prevent rain water from getting to your plant is also ridiculous.
Plants have been growing in rain water since day one and it will not hurt them.
Seeing as you are growing in soil, don't get hung up on having everything perfect, especially when it comes to pH. As long as the pH is not below 5.5 or over 7.5, it won't have a hugely dramatic effect on your plant. It is only when the pH is beyond these two extremes that (true) nutrient "lock out" occurs. As long as you don't do anything that is incredibly lopsided, like adding 2 pounds of manure, your plant will grow fine. I spent the first 10 years of growing trying to get everything "just perfect" and ended up realising, that when growing in soil, having everything perfect wasn't vital. For the last 25+ years I have not ever bothered measuring anything and like I said, as long as you don't do anything extreme, your plants will grow fine.
Cannabis is a remarkably tough and resilient plant and is not the delicate "princess perfect" plant that some people make it out to be. God only knows how it has survived for hundreds of thousands of years without little covers, humidifiers, thermometers or perfectly pHed soil! Treat it with kindness and respect, keep it moist, provide adequate light, good air exchange and feed lightly, and the plant will basically grow itself, no problems. There is absolutely no need to have everything exactly "on point". Growing is about having fun, it should not be a test of perfectness or exactitude. Your plant will not care if the soil pH is 6.9 and not 6.8 or 7.1. It will grow just the same. And does it really matter if you only get 163.8 grams and not 167.2? Or your flowers only have 21.674% THC and not 21.984%?
I am constantly worried new growers are scared or put off in case they don't have everything precisely "correct" or if they are not getting 4 pounds off each plant. As I said earlier, growing cannabis is about fun and learning, not a competition in perfection. If you aren't having fun, what is the point, it only becomes a chore then. And if you don't make mistakes and learn along the way, where is the satisfying challenge in that? I have been home cultivating for medical reasons for the last 35+ years, and yes, I still make mistakes, and yes, I learn something every time I grow and that is what excites me about growing, growing my own knowledge base. If it were so simple to get great results every time, it would become very boring, very quickly.
I can't emphasize enough about how home cultivation should be first and foremost about having fun and learning.
It should not be an exercise or competition in perfection.
Sorry for the digression, I think I took too many "philosophical pills!" today".
I hope some of this answers your question and offers you some help,...........
Organoman.