Fertility treatments after cervical cancer are still an option if you need them. You may get pregnant easily on your own, though! If you had surgery like LEEP or cone biopsy or even trachelectomy, they can still perform the procedures used in infertility.
And the medications they use to stimulate your ovaries in IVF are safe. Cervical cancer is not caused by the hormones, and you don't have to worry that medications, which stimulate hormones to be much higher than normal, will make the cancer come back. If your cancer does come back, it isn't because of the infertility treatments.
Whatever the cause of your infertility--endometriosis, age-related, sperm-related--you can still go through fertility procedures after surgery on your cervix. Yes, you will probably have some degree of stenosis, but they can work with that. Your cervix may be very narrow and tight, but it is not completely closed. After all, you still have periods come through it.
For example, if you need intrauterine insemination (IUI), the catheter, or tube, they use to shoot the sperm through the cervix and into the uterus is so skinny that it can fit through a tight cervix. The same thing is true if you go through IVF--the doctor uses a very narrow tube to deposit the embryos through the cervix.
If you do have some stenosis, you may feel a cramp when the tube goes through the cervix. That might be uncomfortable, but it won't be outright painful. Also, it's very quick. Keep the goal in mind if you think it hurts!
Because so many women have had LEEPs or cone biopsies, reproductive endocrinologists (the fertility docs) are pretty used to working with scarred cervixes. You won't be the first one they've seen, and sadly, you won't be the last.
Generally, they don't advise seeking a fertility doctor until you've been trying to get pregnant for 6 months if you're over 35, and if you're younger, then try for a year. I think that if you've had cervical surgery, it might be a good idea to go earlier and get some diagnostic testing done to make sure nothing else is wrong, like a blocked fallopian tube. After going through surgery for cervical cancer, I think being more proactive about getting pregnant is appropriate. The best outcome would be that everything looks normal, and you are off to try on your own!