The 25th , 26th and 27th my Clear Blue OPK showed Low fertility clear circle. The 28th in morning showed flashing smiley then the evening showed static smiley. The 29th I couldn't do a test as the OPK shows static smiley for two days, so me being curious, I bought another Clear Blue OPK just to test today and it's shown low fertility clear circle. So I take it I've ovulated? When though?