Help please!

Took a test three days ago. Vvvfl. Yesterday I started to feel very sharp pains in my left side. At the same level as my belly button. The pain woke me up a few times last night. This morning I woke up and looks like I started my period. (Light red mixed with brown blood. Only a tiny bit when I wiped before I peed because I felt a little wet. And then after I peed a lot more was there) Three days early is very early for me. I’m usually pretty close to the day that Glow predicts. My side is still in awful pain. Is this just my normal flow? Or is something wrong? I know you’re not doctors but since I didn’t get a BFP I am trying not to over react and go to the doctor. Just trying to see if anyone has a similar experience.