What Causes A Dull Pain In The Ribs?

I am 28 weeks pregnant. This morning while blowing my nose I felt a sharp pain below my left breast, which feels like is now in my ribs. I now have a dull, aching pain which I can feel more if I try to blow my nose or turn my body, still in what feels like my rib area. It is a dull, tender pain now, but I can put pressure on it and can still breathe normal. I am worried I may have done some damage, or worse, done something to harm my baby. Could I have just “tweaked” something or should I go to my doctor to get this checked out? Could blowing your nose too hard cause a dislocated rib, or worse, damage to my placenta or baby, or something like that? I tried to feel under my ribs for a “foot” or something, but cannot notice any “body part” that may be causing the tenderness/pressure. Also, since I am 28 weeks pregnant, I am not certain I would be able to feel if one of my ribs was out of alignment, or dislocated? Should I be concerned, or just wait to see if the dull/tenderness/pressure subsides?