Help Late but bfn

Amanda • I`m 32. Ttc baby #1. I had a chemical pregnancy in August and a chemical again in February. Praying for my rainbow baby
Hey ladies. So I'm one day late but absolutely no spotting from my af and no sign she is going to appear. I took a test yesterday and it was a bfn. My question is.. Has anyone ever been one day late and bfn... And tested a couple days late and get a bfp? If I were pregnant shouldn't it be detected by now?