CANCELLING FLIGHT DUE TO MEDICAL REASONS, NO REFUND

UPON MAKING MY BOOKING WITH BRITISH I WAS UNAWARE OF THE FACT THAT I AM EXPECTING. I AM 18 WEEKS PREGNANT NOW AND I RECEIVED CONFIRMATION FROM MY DOCTOR THAT I WILL NOT BE FIT TO FLY AS I WILL BE 33 WEEKS AT THE TIME OF MY FLIGHT AND I AM HIGH RISK DUE TO MY PREVIOUS MEDICAL HISTORY WITH BLOOD CLOTS AND CURRENTLY BEING ON BLOOD THINNERS THROUGHOUT MY PREGNANCY. I GAVE BRITISH 3 MONTHS NOTICE OF CANCELING MY FLIGHT INCLUDING DOCTORS LETTERS AND STILL THEY WILL ONLY SEE IF THEY CAN REFUND ME. I FEEL THAT OUR SEATS WILL BE FILLED AND THIS IS OUT OF MY CONTROL. WITH MY OTHER BOOKING WITH A DIFFERENT AIRLINE THEY HAD NO PROBLEM IN REFUNDING ME AND THIS IS A LOCAL FLIGHT CENTER NOT EVEN AN INTERNATIONALLY RECOGNIZED AIRLINE.