I received an email offering me an internship with a software company. I accepted the offer and they followed up the email asking for my address so they can draft a contract and I gave them my address. It has been a week since this last email and I have heard nothing, two days ago (Monday evening) I sent an email asking a question about the position (and also just in the hopes to get a response so that it would settle my nerves), but they haven't yet replied to that email either.
I want to know if this is normal behaviour and I have nothing to worry about, or if not what should I do? Should I call them? (I have the phone number of the person I have been corresponding with via email as they interviewed me on the phone previously), email HR directly? Just need a little advice as I am new to this whole thing.