Hi My period is 1.5 weeks late but I have done a few pregnancy tests and they are all negative. However the last few wks I am extremely tired, like constantly, sleep for 12-14 hrs some nights and I m still tired. The last few days I have had a dull ache in the centre of my chest. I am 30 but my dad has recently been diagnosed with lung cancer and I have a lot of stress, do you think it could be down to that? Thank you.