Late Period on Paraguard

So I had my paraguard in March 2016. My period has been on time every month since, but I still haven't got it this month. My boyfriend and I don't use condoms, but he pulls out every time. My body has just been feeling weird, like how it did when I was pregnant before. I was wondering if it's possible I could be pregnant even with the paraguard in and him pulling out? It causes me to have really heavy period so I was thinking it may have moved the iud. Oh and I took a pregnancy test to was my mind. They both came out negative but when I checked it again in the morning one said negative and the other was positive.