Implantation bleeding???

So I started taking Lo Loestrin a little over a month ago. I’ve had sex 5-6 times (tracked in this app of course) since I started taking it. My period was due 2 days ago but the only bleeding I’ve gotten so far is a tiny bit of light brown blood mixed with raw egg white consistency discharge. I had the normal PMS symptoms about a week before it was due but the past few days I have felt fine. No more PMS. Should I be concerned about pregnancy? I’m considering getting a test tomorrow just to rule it out.... could this just be my body adjusting to new medicine?