How does estradiol level rise pre-LH surge?

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SUMMARY

The rise of estradiol levels during the follicular phase is crucial for triggering the LH and FSH surge. Once estradiol reaches a specific threshold, it shifts the feedback mechanism from negative to positive, facilitating the LH surge at the end of the follicular phase. The initial increase in estradiol occurs despite negative feedback due to the maturation of ovarian follicles and their increasing production of estradiol, which ultimately leads to this pivotal hormonal shift.

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seratia
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In the follicular phase, once the estradiol level reaches a certain threshold, it causes a switch from negative feedback to positive feedback on LH & FSH. That is why we have a surge near the end of the follicular phase.

My question is, what makes estradiol rise and reach that threshold to begin with, if it is under negative feedback initially. Shouldn't it not rise, because of negative feedback on LH & FSH?
 
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