what would be the chance?

before anything, i have an iud and have had it for a year now. 
so for haha's and trying to figure out why my calendar on here doesn't show when i had sex, i realized i skipped a period in october, i get my period every month, my last period (nov) i had it for a week and heavier when it is usually 2-4 days of spotting. 
since then my boobs have grown and still are sore and itchy! 
i usually get bloated since i got my iud but i feel heavy bloated. 
and 2 weeks ago i randomly would get sharp cramps on my right side or in the middle, this went on for a week but haven't  since this weekend.
i know it is super unlikely but could i be pregnant? 
i could just be overthinking now that i realized i missed a period. but i haven't had any other usual symptoms.