First Mirena Period

Brianna
I had Mirena inserted on February 17, 2016, and my period was due on Monday (February 22nd). So, I'm about a day and a half late, but I've been having the most insanely intense cramps. Monday night I thought I was going to start, but didn't. Last night (Tuesday) they were so horrible I couldn't stand. 
Now, Wednesday morning, I feel fine; no cramps, no headache. Just a little tired. 
Anyone experience lateness and/or really intense cramping with their first Mirena period?