Vivid dreams early pregnancy symptom???

My period is late by 3 days. I took a test this morning but it was negative. I have been having some symptoms though such as fatigue, light nausea, crampy feelings. But i also heard vivid dreams can be an early sign as well? Which is weird since for the past few nights i have been having crazy dreams. An example of one is that this guy shot me in my head, but it felt so real i could feel the pain in my head. He shot me again, but i wouldnt die. So, he then started cutting me with a knife and i remember it was almost like i could actually feel the cuts on me. It felt so real. Have any of you guys ever experienced this and ended up being pregnant?