Hi. I Am A 20 Yrs Old Woman And Concerned

Hi. I am a 20 yrs old woman and concerned about pregnancy. I have never had intercourse, still a virgin but I had oral sex and think that the semen has found its way inside since there was touching of genitals though no insertions. I feel more tired than usual and there is bloating of my stomach, also an itchy vagina.
Please help.