What else do i need to do to get pregnant? this is seriously affecting me emotionally

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ok i'm 26 and hubby is 28 and have been trying for pregnancy over 3 years now. hubby's semen analysis is perfect. I have PCOS but respond well to ovulation stimulators yet no pregnancy was achieved. I'm not over weight and doctors cant rule out the reson why i dont get pregnant. I tired 4 cycles of IUI and nothing worked. I had laproscopy, hystroscopy and ovarian drilling done, and doctor for early stage of endometriosis and a polyp, removed both and the scar tissues and polyp was sent to pathology and result was it was normal. doctor said she thinks now i have better chances of pregnancy... I ovulated on my own for 2 cycles after that but no pregnancy was achieved, Tests i have done are:-
-thrombophilia (blood clotting)
-VDRL
-chlamydia
-papsmear
-sperm antibodies
- rapid plasma reagin
-toxoplasma IgG and IgM
and all showed normal!!! and no fibroids or what so ever plus both tubes are open and normal..
Went for IVF+ICSI+PGD.. Everything was perfect according to the doctor and returned 2 grade A embryos at blastosyst stage... and yet nothing happened.. I feel devastated and depressed.. what else can i do? Atleast i want to get a +ve pregnancy test only then will i know that i normal??!! will i ever be able to have children??? this is killing me and making me depressed !! please help