There is a photo of seedlings (cotyledons) here....The next, or true leaf, will be distinctly 'hairy'. You said 'weeds in the spot', if these are outside and germinating in the ground, protect from slugs and snails or you could lose them.

Scroll to very last photo:

http://meconopsisworld.blogspot.com/2013_05_01_archive.html

Thanks for the photo and tip- I had thought of slugs and laid sluggo in a ring around where I planted the Meconopsis. Crossing my fingers that they take.