Hi My Names Kayla And I'm 18 Years Old. I

Hi my names Kayla and I'm 18 years old.
I would just like to know if you may think that I'm pregnant.
So the last time I had intercourse was with my boyfriend late sometime last month maybe around the 28 or 29th? And I am over seas at the moment and I have been since the 1st of this month, I have not yet had my period, I had it last month and it finish a bit before Christmas, for the last few days I had some almost snot like mucus discharge and now for the last 2-3 days I have had a lot of brownish discharge when wiping but still no period, I have never been late before so this is really unusual for me. My breasts are really tender and just starting to itch the last 24 hours, I have really visible bright green veins in my breasts and chest. Just wanting to know what you think??
Help.