My husband and I have been trying for 2 years to have our second child with no luck yet. I have an MRI scheduled for Wednesday and am a few days late on my period. My periods are not consistently on time, but there is a chance I could be pregnant. With my first kid, I was 3 days late and it did not show up. So should I buy an at home test or ask them to test me at the doctors? Or should I postpone my MRI until I start my period?