Weird Nightmares

So for the past two weeks straight, I have had a range of vivid nightmares...not necessarily all nightmares but strange dreams. I usually have them once in a blue moon. One in particular was me learning I was pregnant while I was on a rollercoaster holding pink balloons. This was about a week ago. I woke up (reality) and freaked out and felt so nauseous. I never actually threw up, but since then, I have been consistently waking up the same way. The other day I got some of my favorite breakfast and couldn't eat it because it reminded me of wet dog. I have been super irritable the past four days even going off on a coworker (I later apologized) and started crying like crazy on my way home that day bc I felt so bad I guess. Also, I'm 4 days late...but my test this morning came out negative. Is this a strange way my body is telling me I'm pregnant or just a series of weird events and stress. Anyone else have weird dreams when they became pregnant?