Do you think im pregnant??

Okay so here is my story. I have unprotected sex all the time with my boyfriend but it's because I have the morina IUD. I know it's super unlikely to be pregnant when you have these in because they are like 99% protective, but im just not sure!! Or my mind could be playing some serious games with me. It started when in September I got my period a whole week early, and then it still stayed when I was supposed to have it, so yes, I had my period for 2 weeks straight. I didnt go to a doctor because when I was concerned I was camping, and by the time I came back it had ended. But I looked online and it said a 2 week period could be like imbalance of hormones (very likely i have thyroid problems) or a miscarriage, or that you are just now pregnant. So after that, I have felt sick in the mornings. More often then not I feel like I have to throw up and I dont know why. Then when I eat some regular stuff my stomach gets so upset all the time, things I used to eat before with no problem!!!! Also I have been drop DEAD tired. <<<< I am aware that the fatigue would be from my thyroid problems, but it was at a whole new level. And when i had my first kid i was very tired as well, along with the stomachaches. Lastly, my period is 6 days late. I know that's like a big bingo, BUT I use this app to track it, and it's going off of when I logged it last which was a week early from last month. This has really been on my mind, ans I know pregnancy tests are cheap, but I kinda just want opinions before I go buy one.