Opinions on OPK brand..

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So I’ve always used the clear blue advanced opk (with the flashing smiley) and I love that I get high fertility before my surge but they are costing me £30 a month! Never used the cheapies but I understand the test line has to be darker than the control. Are they just as good? Opinions please. 2 days away from AF & trying to prepare for my next cycle and stay positive ❤️❤️

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