IUD mood swings?

Gaby
I've been on Mirena IUD for almost a year now and it's been alright so far, no babies! But I have been noticing that I've been very irritable lately and I'm not sure if it's because of the IUD or not. Has anyone else noticed this? And also, almost every time I have sex I start to bleed, it's mostly spotting but this happens almost every time afterwards!