Pregnant??

I’m 25 days late on my period. I have never been more than 4-5 days late as I have some irregular periods but never anything this late. I’ve spotted a tiny bit the day I was supposed to get my period 25 days ago. I keep getting BFN. My boobs are so sore, my belly is kind of pushing outwards more than normal, I pee so often now and have been throwing up with lots of nausea and fatigue. Am I at a loss? I have no signs of my period coming. Do I need an ultrasound to detect? Has anyone needed an ultrasound because of false negatives?