Hello, I am 11 days late on my period, i have been 2 weeks late before. I ve recently had tonsillitis so i have been taking a lot of painkillers, paracetamol , i m also stressed and I ve been worrying, i know i am defiantly not pregnant because i haven t had sex since august and I ve had 3 periods since then, so is me being stressed worried and taking painkillers reasons why it s late? please help