In regards to your question about BD. I was told to do it every second day (starting about a week or even two before 'O', depending how long your cycle is) until after you have 'O'. We were ttc for 8 months and the month we did this we fell pg.

They say that 2 day old sperm is perfect for getting to the egg and fertalising it. 1 day old sperm is not quite mature enough to do the job properly but it is still possible, I'm sure a lot a ladies have gotten pg from 1 day old swimmers, but they say its the quality not the quantity.

HTH

Good Luck!