I had a medical abirtion 6 months ago..is it possible for a most experienced gynec to find out if i terminated my pregnancy or i was ever pregnant?

No: Once you have completely recovered from the termination there is no way to tell with certainty that it ever happened. Sometimes there could be a suspicion but nothing can be proven if you don't admit to it. However, it is not a good idea to hide medical information because you cannot be certain that it will never be important.

Previous Abortion: if the evidence of a positive pregnancy test or pelvic ultrasound confirming an early pregnancy is missing, then it is difficult to find out if you were pregnant before. We can only speculate based on your subjective information. If you are now ready to have children then proceed.