Trying to conceived for more than 16 yrs

I had my cervix frozen when I was 22 because I had a sign of precancerous cells. After they did the cryosurgery I went back and the Dr. said everything was back to normal but since that day I can't get pregnant I have tried everything what doctors recommend but nothing at first I even though it might have been my partner but he is married not with 3 kids I had 2 kids prior and now I have been with my husband for 4 years and he doesn't have kids and his begging me for one I don't know what to do... Someone HELP!!!!