Inputs please

So I’ve been a little more tired than normal lately. Then Monday my boobs started to get really sore and during the day I felt nauseous on and off all day, then Monday night while brushing my teeth my nausea came on so fast and I threw up. My boobs are still super sore, I’m still really tired, I’ve had headaches, slight crampy kinda pain in my stomach, and my lower back hurts. I took a pregnancy test yesterday morning right when I got up & it was negative.. not sure what’s going on or what I should do next??