I was accepted, but I forgot the username I used to apply :\. Should I email info@yc to get it, so that I can RSVP? [I don't think I had my email in my profile

I was accepted, but I forgot the username I used to apply :\. Should I email info@yc to get it, so that I can RSVP? [I don't think I had my email in my profile either, but I'm guessing it was in the application.]