yes, i am 47 years old and my gyno said my uterine lining is very thick, she wanted to do a DNC, i did not do it. then my periods got very heavy with a lot of clots. Do think the lining is just come out on its own. (nature takes care of things sometimes). Also i have only used tampon 2 times in my life, while swimming, it is ok to use tampons while clotting? Thanks