12dpo bfn ..

So 12 dpo , period due tomorrow and usually I have breakthrough bleeding by now. I have been crampy since 7dpo and around 9 dpo my cervix was low abs hard and now I just checked it and it’s high and softer . I have been slightly nauseous at times and smell of certain things really gets to me ( like my sons cheese puff barf, and usually they don’t bother me). Am I just getting my hopes up for nothing because today at 12 dpo I still got a bfn. With my other two sons I was pos by now.