Evap line and negative test again!

Hi guys, I need your help here.

I am 8 days delayed and I have sore breast all week. I took a test on 21 got negative result, took a test yesterday I did not wait 3 mins and I threw the test in the trash went back after few hours to check and it was positive, this morning I took 2 test but I got negatives. I don’t know what to do, any advices?