 [ Symptoms ] will small business employers be required to provide health insurance or can they force employees to go buy their own [ Disease ] hi its possible that the plan b has altered things which it does its a high shot of hormones plus you have the other hormones from your bc pills so with all these hormones raging round your body this could be why its late this would mean your start date for your periods has now altered do just carry on taking your bc pills as normal as for being pregnant i do not think so hope this helps you good luck