Fertile week

This app says it starts the 4th.-10th Another says the 7th.-12th I've started taking my opk test but want to save the pre seed and sex drive for that week because we agreed to do it every day that whole time .but now I'm confused. Because I can't have sex the 4th -12th to cover all my bases. We will be exhausted 😳😳. And test twice all those days. HELP what should I do.