6 Days Late Neg HPT

I'm wondering if I have finally conceived. My cycle is 6 days late I've taken two HPT that have come back negative I feel nauseous and tired 😴 this would be my first pregnancy ever me and my fiancé are on our toes about this because we've been trying to have a baby for 7 years. We're both healthy in every way possible, can anyone shed some light to our situation???