I started my period 2 week ago, but all of a sudden I started to get abdominal pains in my left side and feeling sick Is it possible thet I could have an eptopic pregnancy? I stop using contraception over a month ago.

I have no idea, but can I suggest going to the doctor?

Maybe, but it could be a great deal of other things too. I also suggest getting to a doctor.

Do you even know for sure if you are pregnant? I would start by finding out, then go from there, it is more common then you think to have a period during your pregnancy, but I would still see a doctor about it as soon as possible.
If you are a first time mom, every ach and pain you are going to question, I know I did. Most turn out to be nothing but you can never be to safe. Better safe then sorry.
Hope that helps

Usually with an ectopic pregnancy you will start having normal pregnancy symptoms such as MISSED period, nausea, breast tenderness because your body is producing hcg even though the baby as implanted elsewhere. This pain could be caused from anything so it would be best for you to see your doctor right away; if it is ectopic then this needs to be treated right away since it can be deadly. Check out this website on abdominal pain:
Abdominal Pain Causes, Symptoms, Diagnosis and Treatment by MedicineNet.com

Oh, I wanted to add to take a HPT... generally if you have an ectopic pregnancy you will get a positive read although the levels will probably be lower then what they should be.