Ovulation or not happening?

I have a question, I have had 3 high OPK kits, the first I have ever had! I thought I wouldn't ovulate at all. I have had many pregnancy symptoms, but all negative results.

Now should I start taking the tests twice a day? Or should I keep doing it only once? 3 positively high, with a flashing smiley face on clear blue. But not a solid face.

Or could these symptoms be a sign of pregnancy?

Please someone help me!!!