I will be about 35 weeks pregnant on Tisha B'Av iy"H.

I had preterm contractions and spotting about three weeks ago and the doctor instructed me to drink a lot of powerade type beverages in addition to water as much and as often as possible. I have a two year old at home as well who was born a few weeks early. In addition, I am hypoglycemic and feel very ill when my blood sugar gets low. The doctor says I should not be fasting but I do not have a Rav I can ask to verify halachically. I don't know if this is a question you may be able to answer for me and really appreciate your time.

Thank you so much.