Okay, i usually get my period every 28-30 days, the 29th of this month (January) i was due to get it, but haven’t yet. I don’t have sexual intercourse, but me and my boyfriend do have oral sex... i’m aware that there is a small chance of pregnancy if seman comes into contact with my vagina, but i don’t recall an instance where that occurred... last week i was sick and was throwing up with dirrarea.. what could be causing me to be late? the past few days i thought i had period cramps??