Is it possible to get your period regularly and not ovulate?

I have a 35 day cycle and it's VERY regular. I just started using clearblue digital OPK's this month for the first time. I'm on cycle day 19 and haven't gotten a smiley yet. I'm a bit paranoid and just worried I'm not ovulating. Hubby and I have been TTC for almost a year. Would love to hear any thoughts and opinions.