BFN but I've been feeling off.

Lisa
Hi all! I've been super emotional more than normal, moody and fatigued. I had some cramp like feelings last week and brushed it off. I have this feeling I couldn be pregnant so finally I gave in and took a HPT and had a BFN. Has anyone else had this? Could I be pregnant still or is it all in my head. I don't normally feel like this but I'm starting to think it's all in my head.