I agree. I don't put any stock into skull theory. and I'm even hesitant about nubs before 13 weeks.
Lassie- I know part of the reason I expect mine to fail is because my cycle was SO messed up and I kept getting positive OPK's so we DTD like I don't know 17 times?!? before I ovulated. I ovulated so late, day 40 almost.
We dtd every day/every other with ds1 and ds2 but close to ovulation, not that many times!
With dd it was a surprise before we were expecting and it was ONE time. Wasn't charting or tracking anything so I don't even know when. I just know we only DTD once without protection in that month.
So anyway I am assuming this time I caught another boy since the frequency was more like the boys.