Quick! When to DTD..?

[steamingminttea]

Have been ttc for three months (mc first go). Am in fertile window so we DTD this morning, with plans to also DTD tomorrow eve then Tuesday am before DH stays away for work Tues eve.

I had a very almost positive opk this morning and I felt strong ovulation pain at about 9pm tonight. Should we DTD again tonight, or wait until tomorrow for the best chance of getting lots of sperms 'up there' (tmi?!)

Tons got. Remember it takes sperm 12-24 hours to get into the Fallopian tubes.

The morning was probably the best time - as @physicskate says you ideally want to dtd slightly before ovulation so the sperm are ready and waiting. If you’re up for an extra try tonight or tomorrow morning it’s probably still worth a try though!

The month I got pregnant we dtd in the morning, then I got a positive OPK that evening. We didn’t manage to dtd again until two days later so I’m pretty sure that was the one!

It can actually only take 30 minutes for the faster sperm to find the egg, with the slowest sperm taking up to 12 hours.

I really wish people would check their facts before posting incorrect information.

Sigh. Me too:

www.infertile.com/get-pregnant-ch-1-natural-pregnancy/
'sperm seem to have a natural tendency toward developing capacitation for fertilization on their own and simply require a period of several hours outside the semen.'

www.channel4.com/microsites/G/TGSR/PDF/Great-Sperm-Race.pdf
Experimental limitations make calculating the actual rate of passage of sperm difficult to ascertain...

Overall data of human sperm distribution in the fallopian tubes of
women have not provided a clear picture of the events of sperm transport. Sperm recovered at various times in different regions of the fallopian tube have varied so much in numbers that the data do not permit the construction of a model for the pattern of tubal transport (Williams et al, 1993).

Sperm progress would also be slowed by the mucus in the lumen. Finally the architecture of the mucosal lining of the human fallopian tube must act to slow sperm progress.

Maximum chances of pregnancy from two days before ovulation:
academic.oup.com/humrep/article/14/7/1835/2913179
www.npr.pl/badania/timing_intercourse.pdf

expectingscience.com/2015/09/28/nine-science-backed-tips-for-getting-pregnant-quickly/

Yeah, I hate it when people don't do their research... especially when it isn't backed up by scientific studies... so annoying!!

From your own research.

And? I don't understand what you're trying to catch me out on? Is it fertilisation after ovulation?

Pretty much everyone agrees there are higher chances if sperm is already in situ when ovulation occurs. After the egg is dropped it's most often fertilised (which is a several step process) with a few hours...

Is it 'sperm takes up to 12 hours'? That doesn't disagree with other statements that it's impossible to pinpoint exactly how long but it isn't immediate and is not inconsistent with my original statement.

Please understand that fertility research has been my bread and butter for the last three years.

Biology is almost more art than science.

Not trying to catch you out at all. You stated that it takes sperm 12-24 hours to reach an egg whereas it is only up to 12 hours for the slowest sperm.

There’s also research that suggests the longer the egg is left to ripen before fertilisation the higher the chance of that pregnancy not being viable. The age of the sperm has an affect on success too. So the sperm needs to be ready waiting for the egg to be released. Optimal time for intercourse is around 6 hours prior to egg being released. Which of course that is almost impossible to get exact.

I wasn’t having a dig.

I see a lot of misinformation on these boards (conception/pregnancy/infertility), everyone is an expert yet there are people being reassured or unnecessarily scared by by one persons view or experience (I don’t mean yourself) so if I see something I know to be wrong then I’ll speak up.