Ok so my period usually lasts around 4-5 days and is heavy for 2 days and then lightens up. Last month my period only lasted for not even 3 days and was very light. Yesterday (12/30) I got my period very heavy but with no cramps. Today I have wicked bad cramps and my period is almost gone. I'm not on any birth control at the time and was supposed to have mirena implanted on Monday. Looks like it won't be happening because they have to do it while you're on your period and it's almost gone. This has never happened before. Insight/advice?!