IVF+ICSI+PGD

H
SO has super low count (100,000), healthy, good motility and morph. Unexplained low sperm count after bloodwork and ultrasound.
I tested on the lower end of normal for follicle count and AMH. Regular periods, no endo, pcos; and healthy.
We decided to go through with IVF+ICSI+PGD.  PGD bc we rather know for certain a chromosomally healthy embryo/baby.  
Anyone have success rate with their first try in a similar situation? 
Any advice?
What's the one thing you experienced that was unexpected? 

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