I wish I could help hun!
I have read it's totally normal for some people to have several days of +OPK. This just means the LH surge stays in your system a bit longer than others. After your first +OPK you can assume you'll O 12-36 hours later. You actually don't need to test after that. but, if you want to just for fun or curiosity (I do it too) don't be surprised if it stays positive a few days.