I am almost 2 weeks late and pregnancy tests say negative. I am not on birth control because I am recuperating from being on depo for to long. is there a chance I am pregnant? or is this normal to miss your period when you take plan b. I am afraid I waited to long. it says its best to take 12 hours but you can take it up to 72 hours. not sure what to do. any suggestions?? and with it happening 2 days before my period I am worried.