Confused

So far my prd is 3 days late & i had light pink spotting on March 19th-22nd on & off but never changed color but seemed too early to be implantation bleeding but now my prd is late . I took 1 pregnancy test about 3 days ago & it was negative. & I am having a lot of nausea, fatigue, eating a lot & my stomach has been feeling weird . Anyone have any insight ?