How will marriage affect the K1 visa process?

My fiance (US citizen) and I (German citizen) plan on getting married in May 2011 and filed the I-129 Petition with the CSC in October 2010. The processing times are stated as 5 months. At the time we did not realize that those 5 months only refer to the time between Notice of Action 1 and Notice of Action 2 and not to the time for the whole visa process. Since we still have not heard anything from California, I am now extremely concerned that I may not get the K1 visa before our already scheduled wedding. Yes, we do now understand that we should not have made the plans before having the K1 visa in hand, but at the time we were not aware of that as we figured there would be enough time. I have the following questions: 1. We cannot change the date of the wedding as our families have already booked their tickets and hotel rooms and the wedding has been planned and paid for. If I do not receive the K1 before the wedding date, I will have to go back to Germany as my 90 day period within the tourist waiver program is up before that. Will I be able to come back as a tourist and get married to my fiance? I understand that I possibly will have to go back to Germany and re-start a whole new visa (for the spouse) process. Upon entry into the country before our wedding I would like to keep things truthful. Will Immigration let me enter if I tell them what is going on? I understand that I may have problems if I state that it is our intent to get married. 2. Would it be possible to stay in the country with my husband and file for adjustment of status from here? 3. Would it be possible to just get married now and file for adjustment of status now as it really was not our intent to get married during this 90 day period? We could still hold the official ceremony in May so that we would not have to waste our families' tickets. I am so worried about this whole process as I would like to do things the right way, but I cannot cancel the wedding in May. Thank you for your help.