If you was on the injection of with me some tablets did it to me to 8 or 9 years ago.
You need to go to the doctors to get something to get you cycle back on track, you may have to do a blood tests and pregnancy test even if you no your not pregnant as in the uk they won't give you the medicine with out making sure your not pregnant as can harm baby.
With in a couple of days to a week I was on but you have to wait till the following period to start trying for baby.
Good luck
Doctors can give medication to get your period going. I hear acupuncture can help too.