ovulating early

I used to have a perfect 27 day cycle and ovulated on day 14 ALWAYS. I could time a clock by AF. well, After I got done breast feeding my daughter, my period came back but it came back totally different. It is now between 29-30 days and I ovulate on day 17. This is supposed to be my fertile week, and I'm on CD 12. I've been having all of the ovulation symptoms for the past 5 days or so, so I took an opk and I'm ovulating... on CD 12.. has anyone else experienced this? Normal? I'm worried!