Hiya Amy
First of all DO NOT PANIC!!!! - An abnormal or positive smear result does not mean you have cancer.
It means you have some changes in your cervical cells that need to be looked at more closely. Abnormal changes (also called dysplasia or dyskaryosis) may be mild, moderate or severe. Most mild changes will go back to normal on their own, but if your changes are moderate or severe, you may need treatment.
I had CIN III (cervical intra-epithelial neoplasia) changes, which meant the changes were severe and the full thickness of my cervical skin was affected. I had a Colposcopy. There was an abnormal area of cells seen - They were burnt away and a biopsy taken - I've not required any further treatment since and that was 4 years ago. Every smear test I have had since has come back clear.
As far as TTC is concerned, it's advisable that you put on hold until you have had your biopsy.
If you are pregnant already, a Colposcopy is safe during pregnancy but biopsy and treatment, if necessary, are usually postponed until after the baby is born. Abnormal cells will not affect your pregnancy, birth or the health of your baby. Most mild changes will go back to normal on their own and even moderate changes are unlikely to progress to cancer in nine months time.
The actual procedure involves having a speculum inserted into your vagina (just the same as when you had your smear test taken). They then look at your cervix with an instrument called a colposcope. This is really like a large magnifying glass, with a light source attached to it. It looks like a pair of binoculars on a stand. The colposcope does not touch you and certainly does not go inside you.
During the examination, they will clean the cervix with sterile fluid and then look carefully at the tissues with the colposcope. They may also take a biopsy of anything that looks abnormal. This involves taking away a small piece of tissue and if this is needed they will use a local anaesthetic so you wont feel anything. I just found it all slightly uncomfortable and somewhat embarrassing when I had a bunch of students peering in from round the screen!
I'm sure everything will be fine - Please try not to worry!