Could i have cystic fibrosis?

Should i have reason to believe i have this awful dieses if i was told i had the test when i was a baby i think it was a sweat test which came back i didn't have it but now im 17 and cough up mucus which is always clear/white my nose is always running and i have to blow it a lot and when i get upset it starts poring and i cough a huge amount up which is slimy white/ clear foamy i also get bronchitis once a year but those are my only problems