Advice

I'm so confused. So AF was supposed to arrive today. She didn't. Just ABUNCH of white milky CM. I'm always always on time. But we used first response ovulation test this month and got when i Od right on. My nipples have been having sharp pains, hot flashes even with my fan on and heater off, I threw up when I woke up this morning and couldn't eAt good til 5 o'clock this after noon. My nipples are darker, and Iv been having pulls and twigs in abdomen. Doesn't hurt like AF cramps just feels weird anyways I took a walmart equate early test and it was a negative. :( has any one had a false negative with this brand. Really needing some hope.