ejaculating on stomach

He ejaculated on my stomach ... Could i be pregnant?

I was wondering about what could happen if the entire time during intercourse, my significant other of 2.5 years was wearing a condom but then as soon as he was about to orgasm, he took it off and ejaculated on to my stomach. This was a COMPLETE surprise to me and it was never planned, it was just something he wanted to try...but now I'm a little worried....