If i ovulated on the 7th and had intercourse on the same night could i be pregnant? and would the morning after pill work if i took it on the 11th?

~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...).