Funnily enough, I didn't end up having to instigate the BD - DH did!!!! LOL I think I am in with a possible chance - but I will have stuffed myself if I get into uni! LOL

I am positive about the increase in temp as that is the most significant increase since I have been temping (just after O last cycle). And historically I have been O'ing on or around CD 17, so that fits aswell.