A very strenuous cough can cause the muscle in the pubic area to tighten and spasm causing a lot of pain, how ever since you have this serious sounding cough when you toke and the pain if it continues after the coughing is over, even if it's mild or dull needs to be checked by a doctor. If nothing else go to the health clinic and tell them you have no money or tight on funds. They have a sliding scale. The type of pain you described in that area is not normal and needs to be checked out!