cloudy days

Hello there. I am living in czech republic and have a 1 week old seedling behind a window in a very sunny room but the last 3 days were very cloudy and i am a bit worried if it will survive a few more days. The sun should come again on friday. If it is bad for the plant i could light over the day in that room
.

Buy a cheap desk lamp and a single 24w cfl in the daylight spectrum range between 5000-6500k. That will be enough light to use off and on over the next week until your ideal conditions return. Good luck

Ty very much

Rotate the plant once in awhile to encourage her to grow straight up. She's leaning pretty far towards the window right now.