Side effects of Plan B?

Briana

a week ago i took plan b for the first time ever after a broken-condom-scare. i took it no more than 2 hours after we had sex. a day or two after i was very tired and i thought that was the only side effect i was gonna get. come to exactly 7 days later, i’ve had mild cramping all day, and just noticed significant spotting. are these just side effects or could i be pregnant? very open to advice and opinions :)