Ovulation timing on Clomid

This is our first month with Clomid (for unexplained infertility), and I'm wondering whether any of you noticed any difference in the timing of when you ovulated. I've only used OPKs one other month - last month - and I ovulated on day 16, the last day Glow had initially predicted for my window. I'm wondering if Clomid changes the timing for women who were already ovulating... Pushing it forward or back a day or two? Any experience with this??