Spotting instead of period (scared)

My period was the due the 6th of December. On the 1st my bf and I had intercourse. Later when I got home I had a small amount of pink spotting when I wiped which I attributed to us having intercourse. I went on thinking nothing of it. On the 4th I once again had this same very small bit of spotting when I wiped. The 6th came I once again experienced this light pink spotting. I assumed it was the start of my period. I waited to see if the next day my flow would pick up as normal. It did not. On the 7th I had one drop of dark red blood. But I believe it may have been less. From the mixture of using the restroom. For the last two days I've had small amounts of brown spotting. I'm worried because my bf believes I'm pregnant. But I am an aerial acrobat so my career in circus arts is very important to me. I have felt bloated but nothing like before I was supposed to get my expected flow. It has subsided slightly. I'm very worried of being grounded. I love flying even though I cant walk lol.