Hey!
What you’re seeing is called **stretching**, and it usually means your plant isn’t getting enough light. It’s pretty common in young seedlings — they grow tall and thin, trying to reach for more light, which pushes the cotyledons way down and makes the stem look long and weak.
At 2 weeks, you should normally see at least the second or third set of true leaves starting to come in. If not, it's likely the low light is slowing down growth, too. Try moving your light closer (but not too close to burn it), or increasing the intensity/duration — around 14–16 hours a day is ideal for most seedlings.
Also, make sure your temps are in a good range (65–75°F / 18–24°C), and you're not overwatering. Once you fix the lighting, the plant should bounce back and start growing more normally.
Hope that helps!