No hope

I was suppose to begin my af tommrow but instead it came today. The flow seems regular and it was a little brown but now just seems like a regular af. Im really not sure if its implantation bleeding.
I dont understand where we went wrong i calculated the times im most fertile, took ovulation tests, prenatals and my husband took a sperm check test and passed. What else could we do? I even did hand stands to keep the "stuff" in. I just feel down and sad..