I had sex on October 3rd and the condom broke. I took Plan B on two days later, which was the soonest i could get my hands on it. I didn't really feel any side effects, i just felt nauseous when i tried to eat. I didn't spot or bleed at all. Now it's October 25th and i was supposed to get my period maybe two days ago? i know that it can make your period come up to a week late, but i am still nervous because I haven't gotten it. my boobs are pretty sensitive and they feel more firm than usual, also i feel a sharp pain in my lower back, hurts mostly when I stand or walk. i don't know if I should worry or not