I am 17 and very worried--

i have a lot going for me, im in the top 10% of my class (im a senior) and do a lot of volunteer work, etc. My boyfriend and I had unprotected sex (i am not on birth control--we used the withdrawal method) and my period is now a few days late--

im usually pretty regular, period-wise and ive gotten my period symptoms, such as a day of "pms" where I was grouchy, and I broke out on my face, I feel bloated, my breasts are tender, and I craved more food than usual--the problem is that these are pregnancysymptoms as well as menstrual cycle symptoms

my last regular period was oct 19, and they are usually about 25-27 days apart

please help??? Am I pregnant??