Iud Pregnancy Symptoms

Hey guys! So I'm freaking out a little. I have the Skyla and I've had it for about 8 months now. Last month my period was almost non existent just some spotting for about 1-2 days. Now I'm about 9 days away from my next period and my boobs have been hurting like crazy. I can't not wear a bra without being very very uncomfortable. I also have bad cramps but I've always had severe cramps a couple days before my period. But I'm 9 days away, idk if these are pregnancy symptoms or if I could possibly be getting my period early. My boyfriend and I have sex a lot and he cums in me every time. I can't tell if I'm just paranoid or not. I'm a little nervous to buy a pregnancy test. Oh also I'm 20 yes old and going into my senior year of college so pregnancy wouldn't be good for me.