Dull burning sensation?

Sarah

Today, I’m 14DPO. Off and on, for the past few days, I’ve been getting this dull, achy burning sensation in my lower abdomen. It’s uncomfortable to where I can’t sleep on my sides or stomach like I always do. I’ve been having to lay on my back. My period is due today, and there are no signs of it at all. Yesterday, I got what looked like a faint line, but today I got a BFN. Has anyone else had the burning sensation before?