Hi, Me N My Gf Had Sex But I Never

Hi, me n my gf had sex but I never penetrated as be both want to wait until we get married, but I just rubbed my penis on her vulva for once after that I did the same but with condom and I never ejaculated when I was with her not even once, but her periods are in 3 days delay, can she become pregnant in our situation. Please help me?