If I ovulate regularly... what could be the problem???

I have been ttc for 6 months following a m/c and d&c.  I track temps and appear to ovulate regularly.  I am 32.  DH is 40.  We bd every day or every other day from about day 8 to day 16+.  Why can't I seem to get pregnant?

BTW, I have been pregnant 7 times with the same partner (4 babies and 3 m/c), and have always conceived on the first try, literally!  

I am going crazy here! I think AF is coming again (hate her!!!) and I want to call my doctor but I feel kinda ridiculous calling after I've "only" been ttc for 6 months.  Also, I have no idea what she could do/tell me/test for at this point as I have a such a successful history of getting pregnant, I just wish I knew what was going on and what could possibly be wrong?!?  I was fearful of Asherman's syndrome for a while, but since my periods are normal, that is highly unlikely.  Any ideas???

[Sheaby]

Sometimes it can take up to a year to get pregnant if there are no known issues.  If you had a d&c, there could have been scar tissue left that may be blocking your tubes, so that even if you ovulate, the eggie still can't be reached.  Good luck!!