This is such a stupid question probably but I have to clear my mind

I’m in university and I share a house with a couple of my friends me and another girl and two guys..... today me and the other girl were taking our time to get ready so I decided to use the shower on the boys side. I’m on my period and I’m feeling a little horny so I masturbated with the shower head. After I was done with my bussiness I noticed some weird dry stuff on the shower head. I know it’s stupid but could I be pregnant from that ???????