Pregnancy test questions??

I have a normal 27-28 day cycle and today is cd 26 for me. My boobs are killing me, way worse then when af is about to arrive, I’m irritable, exhausted all the time like I was when I found out about my son 4 years ago... took a pregnancy test this morning and it was negative.

My question is this... has anyone been pregnant before and their tests were negative until the day of expected af??