PLEASE HELP!

So I am supposed to get my period on today (25th). A few days ago, I wiped and saw pinkish colors. There was brown discharge throughout the day, and the next morning I showered and a drop of blood came out onto the carpet. It ended 2 days before my actual period expecting date. During those days, I also had smegma on my clit, but went away when the “spotting” was done. My boyfriend and I have been having unprotected sex (we usually do, his precum doesn’t get me pregnant). I took 2 pregnancy tests, both came negative. What is happening?