Going crazy

I got my period 3weeks late last month and I tested negative but ever since last month I feel like im pregnant im throwing up sore boobs, headaches nausea, dizziness, fatigue food abrasions, everything just like my other 2 children. Is it possible to bleed heavy for a few days during pregnancy or is something else wrong. Should a get a blood test or just stop acting like a crazy women and its all in my head someone please help 😢😢😢