Hey Gypsybird:
why is it that you think your MRI won't happen for 3 weeks? Does your doctor want you to go to one particular place for the MRI or is there a big wait at the place that you want to go to? Sometimes doctors get kickpacks from hospitals for refering patients to one particular center. Don't let this be the reason you don't get some reasurance sooner.
If you don't have to go to a paticular place you can call around to other hospitals/facilities in your area which have the ability to do an MRI and see if they could get you in early next week. It usually only takes like 15 mintues to get an MRI.
I would definately call your doctor's office and ask to talk with him when he has a moment (sometimes they can call you back after they're last patient of the day or during lunch) or get back in to see him in person to get your questions answered. Be insistent, and tell them you only need a moment of his time. You have to take control to make sure you are confident with your knowledge of your diagnosis and your treatment. Most doctors just go through the motions since they do this every day. They forget that you may not already understand some of the basic things about your condition.
I wish you luck I also just got a diagnosis of Cervical cancer this month on the 16th, two days after you I'm 29 and haven't had childrenyet so I hope this all turns out ok. I see my oncologist for the frist time tomorrow.
I'll say a prayer for you!