Is Pregnancy Possible After Having Oral And Protected Sex?

I have a question, I had oral sex with someone yesterday, and didnt use a condom. Then we stopped and started using a condom. I dont know what comes out of a penis first put what ever was in my mouth I spit out and then continued the oral sex with the condom, then we continued to have sex. Should I be worried about being pregnate, because I really am now.