Overweight, & had unprotected sex 10 days before ovulation (37 day cycle) took plan b after 1 hour (aug 31).expected period is sep 28.pregnancy chance?

Low: You did a great thing by taking the Plan B so soon after unprotected intercourse.When taken so soon, even if you were ovulating, you decreased your chances of pregnancy by nearly 80%. Again, that's if you were ovulating. Of course if you weren't ovulating your chances of pregnancy are zero. Be sure to use protection and consider a more reliable source of birth control given you're 16. Goodluck.

Not likely: If you are correct about when you ovulate then pregnancy is unlikely. If you are going to be sexually active, i'd recommend both using condoms (for birth control & std prevention) and seeing a doctor about getting on birth control yourself.