Opk help??

I just decided I'm going to try opks to see if I'm right about my ovulation times. My period ended on January 31st Ave according to glow my fertile window starts Monday. I took an opk yesterday and just now and only the control line comes up and the test line is super super light, you wouldn't see it if you didn't really look. Is this normal or am I bit ovulating?? I'm so freaking out right now!