What am I to do? What did she mean when she asked for my email?

So I asked for a girls number yesterday and she told me she has a boyfriend but she wanted me to give her my e-mail. And so I did. It wasn't strange or weird, just me being friendly. She hasn't e-mailed me back, and I wonder if I put her in an awkward position, or what she might be thinking. She hasn't sent me anything yet and I need this to vent and kinda sate my curious nature. :P I am 21 by the way.