I don’t understand

she ma

I’m so confused my period is 12 days late with no signs of showing I’m nauseous every night out of nowhere along with some other weird symptoms but yesterday morning I took a test and it was a bfn when I didn’t see a second line I started bawling my husband and I want a baby so bad. I don’t get why I’m so late or why I’m having such strange symptoms I feel like I’m doing something wrong any advice ladies?