Tell me if you think I could be pregnant...?

I use an ovulation saliva microscope to tell when I'm fertile...My little device indicated that I was ovulating around Feb. 10th and 11th. My husband and I had unprotected last night (Valentine's Day - duh!) Do you think there is a chance? I'm not trying to get pregnant - but please don't fuss at me for not taking precautions - it would be okay if we were :-) Thanks!