Hi!
I tend to agree with vbilger that it is unlikely that you are pregnant unless he ejaculated.
There are some interesting new studies suggesting that there may NOT be sperm in the "pre-***" or pre-ejaculate.
HOWEVER sex against your will is a sexual assault and can be prosecuted.
ALSO, I feel I must give you the lecture about using condoms to protect yourself from STIs and finally -- don't forget about the "moring after pill"-- Plan B-- which is available in most major pharmacies without a prescription for women 18 and over, with a prescription for those under 18.
Good luck!
Dr B
I'm sure you have nothing to worry about, unless he ejaculated within the 3 minutes before you stopped it. The late period could be because you've been stressing about it.