am I going crazy

Brianna
Today I am only about 9 dpo. My temp is slightly higher than normal. 98 range. 
My boobs are SLIGHTLY tender and for some reason, before I even got out of my friends driveway I was motion sick. Also today I have had some slight cramping. I am not due to start until the 18th. 
I've also had constipation for a few days followed by 2 days of loose stools, followed by no bm. 
I did take a test this afternoon which was negative, but I feel it might not be accurat just because of how few days dpo and because it was not my first morning sample. 
Anyone deal with anything similar? What was your outcome? Anything helps.