Can you develop asthma? I've been running 3x a week for

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Can you develop asthma?

I've been running 3x a week for 6 months now and I've in the past month begun noticing trouble breathing when going for hard runs.

Around half a mile in usually it becomes REALLY hard to breath and about a mile in I am gasping for air and often it feels like I'm hardly getting enough in.

This is literally at like an 8-8.5mph pace BTW

I was diagnosed with pulmonary stenosis when I was born, but it was classified as mild to moderate and 3-4 years ago now they told me it was very much mild.

The first few months of running I was absolutely gasping for breath afterwards. I would literally lay on the floor hyper ventilating.

I no longer do that after runs, granted.

Is there something wrong? I don't know what the fuck to do.