Help... pregnancy test

I am late for my period. Been waking up VERY nauseous, breast are so sore I have to use a pillow between them, so dizzy were I am laying down the whole room just spins and spins, on and off cramps, and super tired. I tested just 20 minutes ago (4:30 am). I've been up all night, haven't slept yet. The line showed up, then disappeared....????? help never been pregnant. I'm hoping for good news. No rude comments please