Thanks for using the forum.
There is sperm present in pre-ejaculate. It is possible to become pregnant using the "pull out" method. However, the vomiting and diarrhea you experienced are most likely unrelated to any potential pregnancy.
If you are not trying to get pregnant, I would recommend using a barrier method of protection such as a condom. If your period does not come, a home pregnancy test is most accurate one week after the first day of your missed period.
Good luck.
Cathy
if you had diarrhea you're definitely pregnant congratulations!!!