Should the first set of leaves being "wavy&qu...

This looks like overheating first signs, but nothing to worry about at this stage. If you keep an eye on your temperature and humidity level everything should go back to normal quickly. I'll be around, good luck with this baby bro ! 😎

She looks good so far I get the wavy leaves when my veg room gets too dry for the seedlings she’ll be fine if you’d like you could put it in a dome but it she’ll be good in a week or so

It looks healthy alright. Since you started in half a liter pot, be careful with over watering, that could be a reason for the wavy leaves. I would recommend against feeding so early, unless you are using a really light soil mix, and feed around 0.5 EC (250 PPM). Before feeding, I would pot up to a 2 liter pot, when you notice you have tu water more often, like every 3 or 2 days. By the way if you go ahead and feed, be sure to give 7 to 10 days between each feed