If I had with a recycled condom, how likely is it that my girlfriend is pregnant?

OK let me explain. I bought a pack of condoms and my girlfriend and I tried to have . It was the first time for both of us and we were nervous so the first two times we didn't finish. After we stopped I threw the condoms out but after the last time we tried I kept one. Then we tried again and we finished. (This wasn't all in one day either. Not even in the same week, if that matters.) I made sure the condom was on before I came and I pulled out less than a minute after I came. There were no tears in the condom when I pulled out but when I started to take it off the outside of the condom (and where I wasn't covered by it) was a little sticky. That made me really nervous but then I found out that girls' lubricant can be sticky. Please don't tell me that I should never re-use condoms because now I know that and I'm never going to again. Could someone please just let me know what the odds are from her becoming pregnant from this? This has been driving me insane and I would like to hear from someone else :(