Opk help!

I got 3 faint positives on clearblue, frer and a drugstore brand last week. But only negatives on my weird cheap amazon ones ( I haven’t seen any reviews and the only 2 reviews on amazon were bad!) I have a pack of 10 first response opk tests and tried them. 3 days in a row all positive. Has anyone heard they can detect pregnancy? Maybe my cheap ones are faulty? Tests Are top Wednesday- Friday