Chemical pregnancy?

Do any of you ladies think it’s possible to have a chemical pregnancy and not know? I was thinking about my last cycle and I was 8-9 days late. Of course I took hpt’s and they all came back negative. I was feeling nauseous for several days and fatigued and just knew I was pregnant 😞 Anyway, my period finally came, and it came hard! I had the worst cramping and it was a lot heavier than normal. I literally laid in bed and cried. Perhaps it was just that particular cycle, but it seemed odd to me.