Burping, Stomach Bloating, Unprotected Sex Using Pull Out Method. Pregnancy Symptoms?

hi doc i have been burping alot have some weird feeling in my stomach my stomach is bloated. could i be pregnant,coz me and my boyfriend had unprotected sex but did the pull out method three days after my periods (5th of october) and now its the 16th been feeling like this since that day. i expect my periods on the 24th of this mnth. am worried doc could this be that i am pregy?