Ladies I need help!

My last period started March 20th & my period ended on March 25th.

My first day of ovulation was April 10th

(This is when the test read positive)

Last day the ovulation test read positive was April 12th.

On April 13th my ovulation test read negative.

My period is 5 days late as of today.

I decided to take a pregnancy test and ovulation test today.

My pregnancy test read negative.

My ovulation test read positive.

Now I find this to be strange because I was just ovulating about two weeks ago.

Has anyone else experienced this?