My first IUD fell out after a few weeks and I had to get a new one. After getting the second one I got my period. After my period, I felt the strings. I had sex and felt the strings and they felt the same. I had sex again and felt the strings but this time they feel different. Should I be worried that my IUD was moved AGAIN? Do the strings generally move after sex? Before I could feel both strings separately, they kind of curved in opposite directions. Now I just feel what seems to be one thick strand and it's curved a completely different way.