Please help

I gave a guy head and he came and then put his pants back on. About 5 minutes Later we had sex and he used a condom. However, inbetween sex sessions (we were momentarily interrupted by a noise and he put the pants back on to check out what the noise was. The pants he put on were the same pants he had put on after I gave him head and came. He then took the pants back off and we continued with our little sec session. He did not come or take the condom off, but is it possible that semen from the pants he was wearing transferred to the condom he had on, and ended up in my vagina? I do not know if it would be possible to have transferred that semen from his pants, to the condom to finally inside of me.