Really disturbed and CAN'T stop worrying

I'm having a super tough time.

I'm 28 and tutor a group of middle schoolers at a tutoring company. At the center, one of them had his hands under the table and seemed to be touching himself. I cued my while group to get their hands on the table, as i didnt want to embarrass him. This happened a few.more times, so he was obviously doing something down there. I should add, he was holding his hands like he had something sticky on them....I asked if he needed to wash them and he said no. We work on ipads, so I had to touch the iPad he was using.
About 10 minutes later the group was thankfully over. I reported what happened to my director immediately.
I locked up the iPad and pushed in a chair, then went to the bathroom.
As I wiped, my piece of paper was small and I touched myself by accident. I then realized that In the chaos of clean up I never washed my hands after I touched the iPad that boy was using.
I think i am ovulating right now, so im freaked out that if there was remnants of something on the ipad, I could be pregnant. I'm not on birth control.
Is this possible??

I know this sounds messed up, but I don't know what else to do or who to ask. I was going to take a plan b pill, as i am not on birth control, but feel like a scumbag because of the situation!
I know it sounds far fetched but everything online says it can last in the air for 60 minutes!!!! And that you can be pregnant if it gets on or around you, which I wiped myself.

Also....if I take plan b, my cycle coyld get messed up. And I could be due in a week for it. Or, everytime i see a commercial i frrak put, or it will make me think "ooh I was pregnant BUT I took plan b to stop it. of But if I dont take it, i could get pregnant and this would not be okay.

Help. Please.