Abit concerned

Well I’m on birth control an IUD and have been on it for a little while now we’ll I’ve had it long enough to the point for me to miss a period because they lighten up to where I nearly wouldn’t have one now this month since using this app I’m worried because it’s telling me I’m 10 days late when 2 weeks ago it just told me my chances to have a baby were low because of my IUD still being inside. So my question is should I get a pregnancy test tomorrow just in case or set up an appointment with my doctor to see if I’m pregnant and could move the iud before any life possible risks????