Hello. I'm 19 And I'm A Virgin, I Also Know

Hello. I'm 19 and I'm a virgin, I also know that I have a rare type of hymen which makes it impossible for me to use any tampons (it is thick with some very small holes).
I had petting in shower with my boyfriend. His penis wasn't in touch with my vagina but his sperm was on my stomach and then with the flow of water from shower could flow inside me. 10 days after I had my period as usual, it was regular. Now it is over and I have nausea every day and I'm afraid that I'm pregnant. Is it possible?