Menopur injections & estrogen

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Been ttc for 18 months now. Currently now on menopur injections (75)....took my first blood test day 3 and they said my estrogen was low (23). Continued menopur injections on day 10 my estorgen came back as 43...they told me to double my menopur injections (150)....losing hope and hoping we arent lots of money out the window on this cycle! 
​Asking for knowledge anyone has on menopur and the success rate for it! Also natural ways to increase estroen?
Thanks!