What are the chances of me having asthma?

For the past 3-4 days I've been coughing really bad and started coughing up blood, anyway I went to the doctors and he's getting me checked for asthma? My real age is 19... My mum has asthma I know genetics play a big role but wouldn't of it been obvious before now?
What are the chances of me having asthma?
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