Late on period but minor symptoms

I am two days late with mild cramping, and breast tenderness that comes and goes. My breasts have grown almost a full cup size, but they don’t feel heavy like they did with my last two pregnancies. Other than that, I feel perfectly normal. I also can’t stop eating.

I don’t even feel like my period is about to come, but I am NEVER late on my periods other than when I’ve been pregnant. I took a test this morning and it was BFN. I had unprotected sex two days before ovulation, as well as the day after.

What are your thoughts ?