I’m 17 and a few days ago I had sex but the condom came off inside me (awkward) but I took Levonelle to be on the safe side and the lady told me that it’s not 100% effective. I have a brain mri on the 4th of July and I know that mri’s are dangerous for baby’s especially in the first trimester however I’m not due on until after the mri so do I take a pregnancy test before it just to be sure? Also how likely am I to be pregnant?