I really don’t know what’s going on

I started bleeding this really dark brown blood about a week and a half ago. I missed 2 pills the week i started bleeding. I have missed pills before and this has never happened. I’m not supposed to start my period until Wednesday. I haven’t had sex since February 24th so it had been a little over 2 months. I went to the doctor and told her what was up. She tested my urine for infection and pregnancy but both were negative. She told me that it’s most likely just my hormones acting up from missing the 2 pills in a week. I’m not really worried about anything, but I would just like a clearer answer to the problem. (This picture was taken a week ago. The bleeding has lightened up a bit since then)