Thanks for your query.
The chances of your being pregnant are less than 5 %, reasons being -
1. the Plan B
is more than 95 % effective in preventing a pregnancy
, if taken within 24 hours, which is what you have done.
2. The spermicide
further reduces the chances.
3. Total ejaculation did not occur inside , so the chances are minimized.
Hence, do not worry.
However, in case you miss your next period, then take a pregnancy test just to be sure.
all the best.