Need advice

I can’t tell how many DPO I am cause I stop tracking them after splitting from my ex. I have irregular periods too. I had unprotected sex on the day my other app said I was due on. It’s been 8 days since then & it’s not come. I had some spotting yesterday that has since stopped, I’ve had back ache, cramping, queasiness & some dizziness.

I did a test this morning but it came back negative.

Has anyone had this & been pregnant? Is it still too early for it to show up on a test if I am?