GC - we've actually been having a few DTD attempts, but I've had a weird cycle after previously having more stable cycles and initially planned just the one. How old is your LO? have you had a natural non-pill AF so far? I read that most sperm leave the V and enter the cervix within 5-15mins after ejaculation, so I J&D after 10mins
AS - np, it's mainly based on this study: http://www.reproduction-online.org/c....full.pdf+html which showed that a release 8hrs after a previous release halves the total semen ejaculated, and within that amount the sperm concentration was also reduced -i.e. total sperm ejaculated was drastically lowered. For us we planned to DTD during the night when our DS was in bed so DH released last thing at night before bed, and then I'd wake him when I took my temp and we'd BD in the morning. We always aimed to DTD within 12hrs of our previous attempt. If you really wanted to lower things further you could do two releases before using the 3rd batch for your attempt. I think the sooner you BD after a previous release, the lower things will be... but IMO you don't want to lower them too much as we do still want to get pregnant!