I Need Help 😭🤦🏿

I think I may be pregnant but I have no idea. My AF was supposed to come on the 9th however it didn't , so on the 11th I took a pregnancy test however that test came back negative. It's now the 20th and I still have not seen any sign of my AF. I'm trying to wait it out because my AF usually comes after my mom's but before my younger cousin, however my mom's AF has come and gone and now my younger cousins AF is here and they're still no sign of mine. So what should I do , could I be pregnant but my hormonal levels weren't high enough to detect when I took my test ?