Okay. So, I'm having an MRI of my head done next Monday. I was asked if I could be pregnant. I'm still nursing my 17 month old and af has yet to return (took 20 months with ds1). Technically I could be pregnant, so I was asked to take a pregnancy test before Monday. Thing is, if I happened to have ovulated, I could have gotten pregnant a few days ago and the test would be negative. Should I even worry about this?