huge egg white discharge but not ovulating

Arita
According to this app I ovulating last week. I went to the bathroom and after I got done I noticed I huge clear glob. I'm thinking I'm ovulating. I went to the ob/gyn to take a blood test to see if I did...turns out I didn't..so why did I have discharge like I was ovulating?!? 
Note:I been off nexplanon for about 4 months

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