Ct scan?

So Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> I took my daughter into the er because of a really bad stomach ache. It Was her third day of having it so I took her in. Well she ended up having a ct scan, and the dude said if i was pregnant or any chance I could be. Because my daughter wanted me in the room with her. And I said no, because I barely had sex this month. Now today pops up, I'm 4 days from my period, and I'm nauseous, and I started to very light spot pink this morning, now it's turning brown. I'm freaking out cause what if I am? I wore a heavy coat thing in the room though. But What if your pregnant and you stand in a room with someone who is having a ct scan?? What happens??