I And My Girlfriend Had Dry Grinding( With Our Cloths

I and my girlfriend had dry grinding( with our cloths on). She wore a pant without a panty and I wore an underwear. The night before I had nocturnal ejaculation at 1'o clock midnight. And we had dry grinding at 8:30 in the morning. I did not ejaculate in the morning. But I am afraid that the semen that was in my underwear since 7 hours might get my girlfriend pregnant. The semen had dried. Help me