First Outdoor Grow (Ontario)!

This will be my first outdoor grow and even though I'm just starting the seeds I've already messed up! Its day 3 from putting my seeds in soil (which I learned after I should be mixing with Perlite, my first mistake) and I'm thinking that at the rate at which the plants are growing (~1cm/day) they will grow too close to the light within the next week or so😢. I thought about transplanting them to something smaller but I fear the sock of that will be pointless. I know my germination green house is kinda "cheap" but it's all I can afford on this nursing student budget aha. If anyone has some ideas/ recommendations of what I should/try do I'd greatly appreciate it.