What Causes Bubble In Vagina While Suffering From Cough And Cold?

I am 58 and recently found something in my vagina. I have had areally bad cold and cough and thought I strained my lower back muscles, but now find this sort of bubble in my vagina. Is it possible to cough so hard that you could dislodge your uterus or bladder or something. It does not hurt, but I do have alot of lower back discomfort Thank you.l