Hi, I’m 33, ttc for 2.5 years and no joy. Progressive sperm <25% so I think that could be the main issue. After 2 years we did 2 IUI treatments that failed and subsequently moved to IVF this year where we got 4 embryos of good quality, 5 day blastocyst (Grade AB). 1 embryos was transferred straight away with 3 frozen. It didn’t work. Going into first frozen transfer soon. I know IVF is not always successful first time around. How many times would you recommend to do a frozen transfer before we reassess and look into autoimmune testing etc. ?