Please answer my question..it's embarrasing and it's urgent?

I've been masturbating a lot lately..i'm a 20 year old girl. Today, I had a dream in which i was masturbating and achieved an orgasm. I woke up after a while to notice that it was a dream, and saw my roommate in the room. I am not very sure if i masturbated in real or just in the dream, because i wouldn't want to ask her, it would be very embarrasing for me. Her behaviour is just fine with me after that. now, i want to ask if it's possible to have an orgasm like that without stimulation in real life..Please give honest and genuine replies. plz help