Okay so 3 days ago i was with my boyfriend, and i performed oral sex on him - he came in my mouth and i swallowed. I kissed him after so je could taste and then i had a few sips of a drink. We continued to talk and then kiss for about 10 minutes where he then returned the favour. Im concerned there may have been a transfer of sperm from my mouth to his, and then into me? Im on birth control but since im so worried and know the symptoms of pregnancy everything seems like a sign.