Ovulation opk

I did some opk's. And the 1st of March I had almost an positive opk. After that the package of my opk's was empty, I was very busy so I didn't had the time to buy another package.

The 2nd of March I had sex with my boyfriend. My cm was really stretchy and had egg white discharge. Yesterday we didn't have sex, but the cm I had was a bit stretchy, but way less than the day before. Today I have normal discharge. But according to glow my ovulation is today. Could it be my ovulation was the 2nd of march? Maybe I will buy a ovulation package today to take another test, or is this silly to do this? Right now I'm feeling a bit nauseous, feeling cold and have a light headache. I don't know if it's from ovulation I'm feeling like this.