Late but not pregnant 💔

So confused. I’m 3 days late, which in itself is weird as I’m always a day early or exactly on time, and have quite a few symptoms that are unusual for my period so I did a pregnancy test today but it was negative. I kept telling myself I’m not to protect myself as I really want this and we have been trying and I know it can take a long time but when it came out with no second line my heart sank 😭😭