What Causes Pink/orange Discharge And When Will I Ovulate?

Hi, I'm 22 years old, 5 feet tall, and in good shape. I've always had regular periods and have never even had any spotting between periods. My last period ended 3 days ago and lasted about 4 days like always. Weirdly, I've had a light pink, almost orange discharge that started last night. My Fiance and I have been trying to get pregnant for a few months now so of coarse we're having unpertected sex. I've been researching and all I keep finding is it could either be that I'm ovulating or its implantation bleeding. What I don't understand is that its only 3 days after my full period ended and didn't think either of them could be possible this soon after. What could this pink/orange discharge really be? Id really like a kind of full explanation and maybe a little advice on when I should be ovulating. Thank you so much!