It's not clear when you took the PlanB, presumably 48 hours after the unprotected sex. PlanB messes with your next period, taken early in the cycle it often results in an early bleed, taken late it can delay the period. Run a home pregnancy test when your next period was originally expected and another a week later. That is the best way to set your mind at ease.
It seems that you will have to be in charge of buying condoms and seeing to proper storage and use. You can add backup protection by also using vaginal spermicide and staying clear of the most fertile days. Best of luck!