Sorry to hear about the bleed, it's quite distressing to experience this. Yes I have had a dull pressure-ache a few days following a bleed...and often this leads to a coughing fit producing a black 'pip' or two which I can only assume is a scab of sorts. Gross, I know, but after that the ache seems to go away. I often also have a low grade fever afterwards, even though I don't particularly feel sick. My dr explained to me why but I can't exactly remember now, I think it was a common reaction of the body after having blood in the lungs. Or it can be underlying infection. Or it can be, like a nosebleed, just due to a tender area and increased pressure so strenuous activity could probably trigger it. But the benefits of strenuous activity is also great so I would just rest a few days and then resume. If it continues, maybe do a course of antibiotics and then see.
General info: something I did not know is that in CF the arteries in our lungs increase in size (freeways instead of little roads) after the years' of infections, and it can be dangerous to have a bleed happen on one of the 'freeways'. That is why embolisation is sometimes done when you have frequent bleeds, as a precaution, to close off some of those giant arteries. Within a few weeks, to keep supplying the lung tissue with blood, the lungs then sprout new smaller roads which are safer, even if you bleed from them it's usually minor. (I had 1 embolisation even though my CF is moderate, and it has helped a lot)
All the best
Lene'