Sometimes mail sent sooner than another letter will arrive later. Missionaries are transfered frequently and this can cause a missed letter. Your missionary may occasionally be very busy and forget to write. All of these factors may occasionally result in long periods during which you have not heard from your missionary. This is a common experience shared by all missionary parents.
News is good news and no news is good news too.
If there were a legitimate problem, the mission president would have phoned you promptly. Also, please keep in mind that mission homepages are an unofficial service with no official link to the mission home or current mission president. If you need to contact the mission about something, please contact the mission office directly by telephone or letter. Many mission offices do not have internet access. None are equipped to handle email requests, and the email addresses of those that may have internet access have not been made available.