Why me?!

So I had to get blood work done yesterday to see if I was pregnant since I kept getting BFNs on HPTs. Well I found out that I'm not pregnant, but yet AF is still a week late. I have absolutely no clue what's going on with my body. My boobs are sore, I have nausea, and every other pregnancy symptoms. I'm not thinking to much into it and my body tricking itself into thinking I am so I'm feeling like this. I just want to know what's going on with my body!! Ugh