I received a letter from my ob/gyn stating i need to have a colposcopy due to cervical cancer?

Added 25 Jul 2009:

i have never had an std and have been checked for quite sometime now... i just divorced but was with my husband for 3 years and have had paps with nothing come up.. i moved to washington and saw an ob/gyn and thats when i was told all of this... should i go somewhere else and have another opinion? this isn't the first time it has been mentioned to me about these cancer cells.. i was first told they were found when i was 17... could be it be my period that is making the results show this.. i dont have a normal cycle haven't for years i can go months w/out having a mensi then have one for a month straight... i dont know what to do or think i am scared and i need advice from people who have gone through this.. i dont want to loose my chance to have children though..