Shortness of breath?

Okay, so I’ve been on my pill for three years and I can’t remember if this happened before then, sometimes I feel the need to keep taking deep breaths. But if I’m distracted I don’t notice it? I do have a lot of stress but it happens even when I think I’m not stressed? I’m nervous it’s pulmonary embolism. But wouldn’t that happen all the time and I would notice it all the time? Is it stress?