Question on why my plant dissapeared This was like last month

I was doing my first noob grow with a solo cup and my plant dissapeared. I'm guessing a bug ate it but idk. It was about 3 days old, a couple inches tall, and when I visited it last, the seed was hollow and the sapling was completely gone. Could a bug have eaten the whole sapling? I heard that putting beer and pissing around the plant would repel bugs so I did that but it still dissapeared. Thinking about starting another mini grow so any help would be appreciated!