So AF was due 3/14..3/15 so far no AF. No spotting at all. I have had slight cramps on and off and slight lower back pain too for like the last week and a half. I had a little bit of nausea yesterday and today but nothing major. I have been using opks this whole cycle and never got a + they have all been super faint..tried one last night and today and they look a lot darker than before..any input? 😞