Skyla and pregnancy

I have had the Skyla since May. My ex boyfriend and I had sex a lot but at the end of June/ beginning of July, we started doing it a lot without a condom. I haven't gotten a period since June and I know it's typical to not have a period with Skyla. And I do spot every now and then and have really bad cramps but I've noticed myself peeing A LOT lately. Has anyone ever experienced this? I really don't want to be pregnant and I feel like I'm getting myself worked up over nothing...