BFN again!

Briana • I am a mommy of 1 with #2 on the way, a Disney addict, and a wannabe runner 🏃🏻‍♀️ 🤷🏻‍♀️
I am 18 dpo and AF is 2 days late! I have a lot of the symptoms tired all the time, nausea, cramps, dizziness, and this weird twitching in my lower abdomen, I have super smell powers and so on and so forth. I tested yesterday and twice today but all BFN!
Help please ladies!