Confused so confused

I have been taking ovulation test for 3 weeks and these are the ones I am taking today I took a picture of the box and the test I took this morning by glow days my period should of started today and it did but I have another application on my phone called my days that I always go by that says my period should start in 5 days but my ovulation test have been coming back all posture for the last week's and I don't understand I took a pregnancy test it was negative I think it was to early to take but I am so confused