Does this type of test give out false positives?

Does this kind of test give a lot of false positives? I was told I didn't ovulate this month, based off of my blood work and an ultrasound.....I finally just took a third test this morning to satisfy my husband's curiously. As a guy, he thinks that if my cycle lasts longer than it supposed to, I just have to be pregnant. Just trying to figure out whether it's for real or not.