Well I am trying to get pregnant for the last 5 years consulted mANY doctors but in vain.what can the reason be .I am 37 .I have a son 8 yrs. Please please help me out

If you have not, you should consult a fertility specialist. There is no way we here can help you. You see, we are not doctors, and cannot run the necessary laboratory tests to determine the reason for your lack of conception.

Is it possible that your partner may be infertile? Remember, it's not always the woman who has the problem. Maybe your partner should get tested as well.