You will be fine. the seed doesn't need fertilizer to germinate, just water.
X2. I'd go with something besides urea.I think urea will either need to be incorporated into soil or needs rain soon or it is lost into the air.
X2. I'd go with something besides urea.
If I apply next week before a rain, is a 24 hour period going to make it weaker?
Urea is usually what I use. What else could you recommend, specifically? Don't know a whole lot about the different types of fertilizers out there.