Late period :(

Anna • *Mummy of 3 baby angels ( first loss Aug 2018, second loss with twins Jan 2019) after IFV treatment; 2 chemical pregnancy. Waiting for my rainbow baby. 🤰😇🌈
Hi there! My period was due last week on Friday 7.04, on Sunday i took a pregnancy test and i've got a red line and a second fainted line. Now i am 6 days late and negative pregnancy test. What's going on? I don' really understand. Is there any chance to be pregnant but not have enough pregnancy hormons or something else? Thanks :(