Possibility of being pregnant on IUD?

Okay so I’ve had my IUD for about a month and a half to two months and my period will be starting in 5 days. I’m probably being crazy or overthinking but my boobs have been sore for a couple days and I’ve been having nauseas spells here and there and I’ve been eating onions and mayo like it’s going out of style. My dr just checked my strings like a week ago. Is it possible I’m pregnant or am I crazy? Lol