Am i pregnant?

i’m 15 and have been with my bf for over a year now, i got an iud around 3 months ago because i have sex with my partner regularly. But recently my body has been feeling really strange, i’ve been waking up every morning feeling quite ill, i’ve been bleeding for 2 months straight and i need to go to the toilet a lot more often than usual, could i be pregnant even though i have an effective form of contraception? i want to do a pregnancy test but they’re not super easily accessible where i live so i want some advice before i go out of my way to buy one, could i be pregnant? is it just a side effect of the iud? advice please