6days late

I took a test after the third late day since I’m normally 1-2 days late. It was negative. I hadn’t been experiencing any pms symptoms the week before other then sensitive nipples.

I started feeling nausea, without the urge to vomit. My nipples got more sensitive and I didn’t have an appetite for any food.

I took another test the fourth late day at 5am before work, still negative. Now I’m 6 days late, still no period. Just mild cramping, no spotting, sensitive breasts, and a little nausea.

Is it possible maybe the dollar tree tests aren’t detecting anything? Is there the slightest chance I could be pregnant?