ANYTIME you have unprotected sex, you risk getting pregnant. So yes, there is a chance you could be. HOWEVER, the symptoms you are describing can also be you expecting your period, and if you felt your egg drop that means you are starting ovulation. So you may get your period. Wait a little while and see if your period comes. If not, take a pregnancy
test or see a doctor.
Also, no offense, but you sound young. If you are young, you really have no business having sex, protected or unprotected!