I have got some clothes in the cupboards "in case I get pregnant". I have two pairs of trousers that were very expensive, which I bought in the summer sales with a jacket, wore for an interview in the autumn, kept for "best", and then lost so much weight I can't wear them again (the jacket went to charity a long time ago). Mainly I lost weight round my waist (7") and I think the last time I looked at them I was still assuming I'd get pregnant pretty quickly.
I also have two or three support vests/soft bras that I bought for wearing in bed. I am an F cup and got uncomfortable very fast. In fact, I am sometimes that uncomfortable in the last week of my cycle, but I just cannot bring myself to wear them while not pregnant. It was never worth buying them before I got pregnant because it doesn't happen every month and it's only a few days.
In other news - I told Mr Spouse about the boy sperm comment and his reply was "nah, they're all down the pub busy telling each other 'you don't want to go that way, it'll take you hours longer, take the A35 and that way you won't get caught up in the temporary traffic lights in Cleckhuddersfax, my mate tried that the other day, the trick is to turn off down the road just before B&Q, it looks like a cul-de-sac but in fact you can get out on to the dual carriageway'."
So there we have it. The real reason for male pattern infertility.