im starting to get a bit worried........ jan second my period ended....jan 3rd i had sex with my husband..we used a condom towards the end....within 24 hours after that i took plan b....a week later on the following sunday i started to have a brown discharge whenever i wiped i was spotting for 3 and a half days....when the spotting started i also started getting headaches, nausea, heartburn, bloating, cramping, and my appetite has started to increase im worried the plan b didnt work....i have used plan b in the past and i never experienced these symptoms also i am over 175 pounds. help am i pregnant?!