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Ff says to start testing on CD4 when still bleeding. What's the theory behind that?

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Reginamangina Fri 31-Jul-15 20:50:07

It came highly recommended so I signed up for the Fertility Friend app. It's telling me based on previous date to start testing on CD4. As my insides are still escaping at high speed and I'm reliant on pretty strong painkillers still, what chance have I got of actually getting laid let alone pregnant should I test positive on CD4?

Usually OPKs detect a positive around CD10 so I'm not sure why FF are saying to test from day 4. Obviously it's only an estimate but I'm curious about the theory behind testing mid period.

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