Must be I’m ovulating early...

Earlier today i took an OPK and it was close to a positive, just took another one and it’s reading positive. I’m not supposed to ovulate until Friday or Monday according to apps... i usually ovulate CD 21-22 and it’s only CD 18

My husband and I are going through this TTC Journey pretty blind as non of our family know we are TTC... this is my only area i can express everything and ask questions.