I am 16 and sexually active, there has never been a time where i havent used a condom. i had my last period almost 2 weeks ago and have had sex once since then. and for the past 5 days i have felt nausea, constipation, ect. and i'm terrified of being pregnant. i have had many scares and i think they are all psychological because i always get my periods. the pregnancy paranoia has gotten to the point of me literally thinking i'm pregnant, and possibly getting these symptoms for it. how do i know if it's just me being paranoid again or real symptoms? i just need help understanding that IM NOT PREGANT! HELP