When to test?!

So my husband and i are TTC baby #2 and I am 6 days late from starting my period. I took a digital pregnancy test 2 days late and it said “not pregnant” so i waited and took it again today and same thing. I was looking and i think the day we might of conceived might have been 2.5 weeks ago. So maybe my Hcg levels aren’t high enough? How long should i wait to test again? I have had zero spotting, the last 2 days i can smell everything, and dinner made me sick last night.

Am i possibly pregnant?

Thank you in advance for your input and help!