Fasting and fertility treatment

I am in the middle of fertility treatments after several miscarriages. My two week wait officially ends on Tisha B’av so I do not yet know if I am pregnant. My doctor said I should not take any risks and she strongly recommends not fasting, both because I am in high risk category and because I am taking medicines which can make it easier to get dehydrated. Is there any heter to start out not fasting or would I need to wait till I don’t feel well to ask a shaylah? Thank you.

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