New at TTC & 1 day late

My first was a birth control baby & I was 16. So I had no plans on trying to have a baby. We are currently trying to have #2 . I've been off of birth control since April. Had my period In May on time. And now I'm 1 day late this month. Took a test yesterday but I think it was negative. It was a store brand rite aid ept test. I'm very nauseas (which I never was with my first) but as I'm reading I'm seeing all these posts about "tweaking" the picture and inverting it & whatnot. Maybe I should test again ? I'm not sure what to do. I don't think I can get pregnant so fast but who knows. Any help is appreciated.