Please help

Ashlyn • from Nashville, Tennessee. I love meeting new people. Add me on whatsapp to chat. Hoping to have a baby this year.
I am three day late on my AF and have taken several pregnancy tests. All have come out negative. I am showing no signs of pregnancy but am late. If I were to be pregnant, when should I be able to get a positive? It's been 4 weeks and 3 days since my last period.