Before I say anything else, I must tell you this: Get an attorney! Tell your attorney what has happened and she/he can (try to) find out if you have been indicted and, if you have, proceed from there. If you cannot afford an attorney, you can ask the court to appoint one for you. You might have qualified for an appointed attorney during the investigation, depending on your involvement with the grand jury proceeding. You can contact the clerk of the local federal district court to find out more about that.

Now, as to the general information I promised: You say the case "went to" a grand jury two weeks ago--does that mean they began an investigation two weeks ago? Or does it mean that they were asked to vote on an indictment two weeks ago?

If it's the former, it could be quite a while before they reach the indictment state, depending on how complicated the case is and on how much evidence thegovernment already has.

If it's the latter, it could mean they have already voted and an indictment has been returned, it could mean they have already voted and an indictment has not been returned, or it could conceivably mean they have not yet voted (maybe they wanted more evidence?). 

Even if they have already voted to return an indictment, you may not know about it for a while. Aside from anything else, it is possible for an indictment to be sealed (i.e., not made public) for a period of time, if circumstances warrant.