Please wait till the doctor gives you a pregnancy test before you start worrying. I was on the opposite end and went into premenopause at age 32, and was told I would not able to have children. We were told by doctors to not even bother with birth control as my chances of getting pregnant on my own were less than 1%. Four IVF attempts and several losses later, I (unexpectedly) have twins on the way at 40.
My own reaction when I found out was to throw up, sheer terror, not knowing how I could handle this (I already had a small child). Time has gotten me used to the idea and I now feel blessed - I just keep telling myself, "God never gives us more than we can handle".
So if you are pregnant, don't despair, give yourself a few weeks to come to terms with it. Granted, terminating the pregnancy is an option but that can carry huge psychological issues for years (even if you think you want to), as well religious ones (immediate excommunication from the church, for example).
I recommend talking with Dr. Joanne Stone at Mt. Sinai in NYC - she is a specialist in high risk pregnancies, including advanced maternal age (35+), and she can go over all risks (for mother & child) and options with you. She is also highly regarded for CVS testing, which can be done at 10 weeks, and will help give you a clearer idea of risk factors for the baby, including testing for conditions such as Down's Syndrome which is more common past age 35.
You might decide to bypass CVS and amnio testing altogether, like we did (there's a small chance of miscarriage from the procedures) and only do prenatal non-invasive screening (bloodwork and ultrasounds).
This is a difficult situation to be in, my thoughts are with you.