Marina IUD

I’ve had my iud for 1 year an 2 months and for some reason I’ve been on my period for almost 3weeks!!! (Just recently started doing this) 😭. I wanna get off of birth control because I’ve been on it for 6 years was on the pill for 5yrs and switched to my iud but I don’t know what my period is naturally like anymore and I wanna get fertility testing done so I can see if I’ll have any issues getting pregnant in the future (runs in my family)