Are OPKs necessary?

Camille • ♥️ IVF baby 03/2021 • Miracle baby 11/2017 ♥️
We're starting TTC again in a few months and I want to make sure my fertile window is as accurate as possible, but we're also saving up for a house/maternity leave and I've heard OPKs can get expensive, and they look confusing. How important is it to use them?

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