Help please

My calendar said that I was due to ovulate on the 8th of March, however I got egg white discharge on the 12. We BD every day from the 8th until the 15th.

I got my fist faint line on Monday the 19th and they have become increasingly darker each day.

Yesterday I had strong twinges on my left side near my ovary, it went away, but today I have had light brown discharge. I have such strong nausea as well today and last night

My period is due on the 23rd of March. Can someone help explain this.

Am I losing it already, or could this still be implantation bleeding?

EDIT - I think I have worded the whole thing wrong. Ultimately, my question is.... is it normal to have drown discharge after positive tests as I thought this would occur before a positive test?