Question: Sharp stabbing pain on my right side…I am a smoker

I’m having a sharp stabbing pain on my right side, I am a smoker but believe this is unrelated. It’s almost the same feeling after running a mile or two& can’t catch your breath! Been coming and going a couple weeks but pretty constant! My period has also been extremely irregular & ongoing for appx.20days I don’t know if it’s related, but need help!