Can intercourse move IUD?

I am just starting to end my period, I currently have a light almost spotty flow. I had sex this morning and then I went to check my Skyla strings in the afternoon and couldn't feel them at all. I recently got Skyla for the first time on December 28th, and was wondering if having sex can actually move the IUD out of its place?

Update:A day later, I noticed that my flow got heavier than its light/flow when my period is ending, almost like I'm restarting my period. This is a sign something is wrong, yes?