Which tests should I do after a first failed IVF? I m 39, TTC more than two years. Had somewhat high prolactin a year ago, now it s normal due to bromocriptine. All other tests are normal. Transferred 3 embryos, 1 of 8 cells, two of six. Doctors said they looked good. Starting a new supplement regime by my own initiative, as Doctor only recommends folic acid! Should I do a test for natural killer cells?