Low Fetal Heartrate

I just had my first gynae check up today at 9 weeks. Gynae informed that fetal heartrate is low and to come back in 3 weeks to check if there is any further development. Told me to not tell anyone of my pregnancy yet as im at a miscarriage risk. Just feeling bumped out right now. Any mummies out there that have had similar exp but manage to pull through? Would love to hear some encouraging stories.