What is going on with me?

Amanda
Today I'm four days late so I took a clearblue and got a bfn! I'm so confused on what my body is doing, I've never been more than a day late. I'd be fine if my period would start or I had a bfp. This is our first month "trying" (not pulling out) so I obviously didn't expect it to happen so quickly. The only symptoms I have is nausea at night and sore boobs and they didn't start until I was a day late. I always have sore boobs leading up to my period so it was weird that this month I didn't. I don't know what or if there's anything I can do.