i have relatives in irvine. it's a very ... clean place.
you got semen on your vulva. yes, you have a real risk of pregnancy AND STD exposure. What you need to do is called Planned Parenthood 1.800.800.PLAN or your doctor and make an appt ASAP to get emergency contraception AND an STD screen (for both you and your boyfriend).
EC can cost around $35 and is most effective within 72 hours of the sexual encounter.
Don't be coward like shrimp, be brave like PRAWN!