9DPO bfn’s but I feel pregnant.. why

I’m so confused and disappointed. I’ve taken a test today and yesterday with nothing at all not even a faint line.

However my boobs are stinging and have been for two days now. I can feel them throbbing on my chest. I’ve been getting cramps since 6DPO. Still am getting cramps today. I’ve had heightened sense of smell like being able to smell my sons poop the second it pops out his butt hole from half way across the room 😂 And this morning I was nauseated from not eating. I’ve never had these symptoms in previous cycles where I didn’t conceive

So why am I still get a bfn.. is the mind so strong I’m hoping for a BFP and creating these symptoms