Had intercourse on ovulation night on the 7th can't get the morning after pill until the 11th what are my chances of not getting pregnant?

~85% chance it works: Some thoughts... Consider taking a morning-after pill as soon as possible, because the sooner the better. If no normal regular period comes in a couple of weeks, one can consider checking a urine pregnancy test. If having sex and not on a birth control pill or other reliable method, then a woman should always carry condoms wherever she goes (that means keeping them in her purse, pocket, etc...).