I'm 47 and six days late. Usually very regular. I had a tiny spot of blood on the day I was due. And since then lots of white viscous mucus on wiping and in knickers. Way more than usual. I have had lots of sex from day 20 onwards. Tests negative but one has a blue line. I'm thinking that the levels may not be high enough yet although tests say 99% after period due. Thoughts?!!