Spotting or AF? Has anyone experienced this?

Has anyone experienced a semi-heavy spotting? As far as right now i am unsure if i am pregnant.I have had been sexually active all last week. Now i might be spotting or i may have my period. However, i'm not supposed to get my period untill the 22nd and i got whatever this is the 14th. It was extremely light the 1st day, heavy the next, and now its back to light and it seems to have stopped. It's also a deep redish brown.

I've also experienced nausea almost everytime i eat, headaches, 3 nosebleeds, and extreme fatigue. Do you think i may be pregnant? Have any of you expirenced something like this?