Any Drs in here? MRI question!

Francesca • I`m 31 and We just had our 3rd baby! A boy after two girls! Lots of losses 😔 my first arrived at 28 weeks, after five years of trying, our second arrived at 34 weeks, and our third arrived at 34 weeks too! So blessed!
Hi guys, I'm booked in for a full back MRI (I have degenerative disc disease) about 3/4 days after I ovulate this cycle. They said to tell them if I might be pregnant, but there's no way to know that early! So does anyone know the risks? Should I rearrange the appointment? I've had 5 losses so am slightly nervous! Thanks!