Pregnant with IUD??

Tayler
So hopefully I'm not really sure if this is normal or its just in my head.... But I'm having problems. 
I've had the IUD for about 2 months. Been in so much pain because of it too. Also I've had sex with my boyfriend on several occasions. I use to spot a lot when I first got it but haven't in a while. We don't use protection because I'm allergic to latex. 
Recently I've been getting sick even when I smell food and haven't been able to eat. Almost every single night I come home and run straight to the bathroom to vomit. I have also taken a pregnancy test and it came up negative. So I don't really know what's going on. 
Hopefully there is someone out there that has had the same problems or someone that can help. 
Pleaseeeeeeee!