Pregnant?

Sara
Help! I really need some help.
​I'm a 20 years old, and I have had irregular period all my life. My bf and I are active, and I have 3 days since my period hasn't come. We always use condom, but last weekend was our first time trying anal... I know I can't get pregnant in that way, but what happens if the semen touched my vagina when it come out? I'm really worried