Ovulation the day after period ends?

I just did an ovulation test and my period ended yesterday I got 2 positive lines...... Why could this be?  My period has been weird since last month when it came 2 days late.... That time we had sex around my ovulation but then when my period came and a negative test the day after my first miss I figured.  I'm on a 28 day cycle.... Why could this be :(.