birth control
"Luckily for me I really trust and like my obgyn b/c the insertion is quite invasive, probably the most invasive procedure I've been awake for. Never had kids & my cervix wasn't happy to be forced open.  Getting the sounding tools seemed to be a bit of a challenge, and it caused some crampy/pinchy feelings but nothing too bad. . .despite the sounding she still hit the top of my uterus hard with the skyla upon insertion and that was painful (still bearable). I had regular period-type cramping the next several days, which is to say at points distracting, but nothing horrible.  
It's been 16 days since placement and my period wasn't due until two days from now...however 8 days ago I started bleeding like  regular period and it hasn't stopped yet."