Some answer me please

tinaaaaa

Okay so my ovulation test digital I had ran outta sticks & I just got more yesterday & I’d been getting flashing smiley face before I ran out I used the line ov test but can’t figure out how to read them so yesterday I got more test strips for the digital & took a test it came back as the solid empty circle ⭕️ & then this morning I got a flashing smiley face. So I’m confused as to why this would happen ???