Can my wife get pregnant if she takes plan b after her one week of ovulation?

Use Plan B: Anyone having intercourse without birth control or condoms may get pregnant. If intercourse was within 72 hours you consider taking plan b. Ella (ulipristal acetate) is another brand that can be used up to 5 days after unprotected intercourse. Plan b is a high dose of birth control to disrupt the hormonal patterns to delay or prevent ovulation. Abnormal bleeding after is common. Check preg test in 10 days.

Possibly, Depends: Plan B can reduce unintended pregnancy up to 5 days after unprotected sex, and can be taken anytime during menstrual cycle. It is most effective if taken w/i 72hrs (~89%), but significantly less effective if taken 4-5 days after unprotected sex. A recent study found that Plan B is less effective in women >165lbs, and not effective if >175lbs. Pregnancy risk is lower if sex 1wk after ovulation.