ADVICE?

Samantha • 20 - Expecting baby #1👶🏾💛
AF is a week late, I tested at 3 days late and it was BFN! Am I out this month? Because I thought at 3 days late I would have enough hcg and I was using a 10mul pregnancy test.. Should I re-test now I'm 7 days late or is AF on her way as I've already had a BFN!?