Soooo af was due the 18th

I'm like clockwork , tested negative the 18th and today the 19th , I'm hoping it's just too early. Trying to make myself a deal to wait a week and see if af is just magically late. I've been pretty nauseous the last couple days and especially today light cramping. But over the past week I have had none of my normal pms symptoms.

The last time I was late I didn't realize till I was miscarrying at 6 weeks. I'm reasonably unstressed, I eat pretty good since I have celiacs. Its possible to have negative tests early on and still be pregnant right?

Here's hoping af never shows !