I've never tracked my ovulation or my bbt. My temperature was the highest two days ago, and starting yesterday I've been feeling down, I have a headache, and I'm slightly bloated. I looked it up and I think my ovulation happened because of how I'm feeling, I guess it's called premenstrual syndrome. I've used ovulation test strips, but they all came back negative. I read on the ovulation package it said that not all women have a high enough level to show up in a test. What do you ladies think?