You would need to provide more information because we don't understand what you're asking. What precautions? Having sex for 8 years without conceiving isn't bad and shouldn't affect your ability to become pregnant.
If you mean sexual relations...do you have a boyfriend/husband/significant other?
Well...if you are trying, I would say visit your doctor. Let them give you a check up, you won't know if anything is safe or harmful until then. Hope I helped.
By physical relations, you mean?