pregnant or AF?

An
AF is due today (1/31) and I've had no symptoms up until about an hour or 2 ago i started to have slight cramping. Feels like normal AF cramps but nothing coming still. Took a test 2 days ago and it was BFN. Is this AF or could I still be pregnant? It just seems weird I only start cramping when AF is due (I'm afraid it's AF) 
TTC #1! 🙏🏻🤷🏻‍♀️