Not sure whether to be worried. My last period was 8 days late. I have now started 20 days later. I don't even think I ovulated. I usually get a PMS migraine but I haven't this time. My psychiatrist sent me for blood tests to check my hormones but I won't be seeing him until April. I will see my own GP in Feb after my bone scan & he will have a copy of the results. I think stress delayed my last cycle but I can't understand why this one is really short.,