You can probably do without nutrients for a couple weeks. There are some nutrients already in the soil, and did you use MG perlite? That also has trace amounts of MG nutrients in it. A lot of people have great success with Fox Farm's nutrient trio, Advanced Nutrients makes some great products, many people swear by Jack's Classic nutrients and they are under $20 apparently. Look around, see how much you want to spend, then make some purchases on a nice base nutrient.
B-52 is a great additive though. It's used mostly for shock stages (seedling breaking the ground, transplanting, switching photoperiods) when plants need B-vitamins the most. When you give it B-52, it allows the plant to stop making B-vitamins internally, and focus the energy elsewhere into the plant. And since it's from AN, it's "pH Perfect."