Pregnant?🤷🏻‍♀️

I was supposed to start my period the 20th of October. I started light bleeding 4 days early. (Implantation?) It was very light. I thought it was my period so I just ignored it. Until I started realizing that this doesn’t seem normal for me. My cycle is like clockwork, always on time and I always bleed a lot for the first 2 days. This time, it was very little blood, no clots, and after 2 days all it was was spotting on and off. Might I add, I’m usually in so much pain the first 2 days with a period. This time, I had no pain. Very light cramping. I was so surprised. It caught me off guard. I took a pregnancy test and there’s nothing there. What should I do?