Can you ovulate for 3 days?

2 Tuesday’s ago, I felt like I was ovulating so I assumed that I was. However I felt the same way Wednesday & then that Thursday I took an opk and it was positive. Now 2 Tuesday’s later, AF is starting I think. But now I’m super confused because an opk test is positive BEFORE you ovulate. And even if I was still ovulating on that Thursday then that means that I ovulated Tuesday-Thursday because my period is starting right now and it’s exactly 2 weeks later from when I assumed that I was ovulating. Is this correct? And I’m saying that AF is starting because about an hour ago, I started cramping really bad and now I’m having light brown bleeding. Sounds like AF right? I just didn’t know that it was possible to ovulate for 3 straight days cause I also had unprotected sex the day that Friday after I took that opk test 😯