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What are the chances of a BFP if sex only occurs on day of positive OPK?

(12 Posts)
Writerwannabe83 Fri 22-Jul-16 19:18:10

Hello all, apologies for the rambling but I'm just after any advice.

I did an OPK yesterday morning at 07.00 (first picture) which I considered to be positive and when I tested again at about 15.00pm the line was even darker. We DTD last night.

I did an OPK again this morning at 07.00 and it was a little bit lighter than yesterday's morning one but still dark enough that I would class it is a high/positive (second picture).

I tested again this afternoon at about 16.30pm and the test line was still there but really, really faint.

I know people say that the best chance of conceiving is to DTD in the 5 days leading up to ovulation but could my one off DTD session slap bang between my two positive OPKs still lead to a BFP?

I don't really understand how the LSH surge works in relation to actual ovulation as I thought the surge came, ovulation occurred and then the LSH levels dropped immediately and this all happened in a very short time frame and therefore I was surprised to get two very dark readings 24 hours apart.

If I got my first positive reading yesterday morning and it was still dark this morning when would you predict ovulation would take place?

Is it worth me DTD again or would ovulation have most likely occurred yesterday following my initial OPK in the morning?

Frecklesfrecklesfreckles4 Fri 22-Jul-16 19:23:57

A positive OPK means it is likely ovulation is imminent but the only way to confirm it has taken place is to check for a temp change , so in the absence of that information I would say, it's likely your timing is good , sperm will live in the tract for several days anyway, but there's no harm in playing safe and dtd again.

hawaiibaby Fri 22-Jul-16 19:27:27

Still a good chance if there are no fertility problems. You probably dtd the day before ovulation so well timed and it's definitely worth dtd again tonight as you may have ovulated earlier today so again, still a decent chance. Good luck!

ahsan Fri 22-Jul-16 19:39:08

I had Dtd one day before I ovulated and become pregnant. Only had DTD twice that month and other time was when I wasn't fertile. Know my system as this is now my third child and I feel ovulation (one of the lucky ones) smile

Gardencentregroupie Fri 22-Jul-16 19:42:49

I had a strong positive at about 3pm, had sex at midnight, had a negative opk the next afternoon, and a bfp 13 days later.

An LH surge can be short or it can last quite a while. You've caught it on the way up and way down probably. Ovulation occurs between 12 and 36 hours after the LH surge. Sperm can last up to 5 days, some say a week, so 12 to 36 hours is nothing smile good luck.

Writerwannabe83 Fri 22-Jul-16 19:55:21

Thanks everyone for your thoughts and experiences.

I've got one DS already (aged 2) but when TTC him I wasn't tracking or using OPKs so wasn't concerned about the theory/science behind conception.

I might try and get some more action out of DH tonight then grin

ahsan Fri 22-Jul-16 20:37:23

smile hope you get you BFP soon smile

MmmMalbec Sat 23-Jul-16 11:58:44

I asked the same question a few days ago because I was away so we only managed to DTD either the day before or the day of ovulation. A few people said they'd got their BFP by doing that and one lady shared a study that said the day of ovulation was the best day. I'm either 7 or 8dpo so too early for me to know yet. Good luck!

MmmMalbec Sat 23-Jul-16 12:00:45

But like others have said you've got a bit of notice after a positive OPK so I'm sure you're covered!

Writerwannabe83 Sat 23-Jul-16 21:39:10

Well I didn't get any action out of DH last night so it's just that one night.

At least I won't be going crazy symptom spotting this month as I will feel that the chance of conception is so slim that there's no point in thinking about it.

boobear210588 Wed 10-Apr-19 22:15:03

I dtd day before I had a positive opk and the day of positive opk what are my chances

crazychemist Fri 12-Apr-19 13:22:15

@boobear210588, you realise this is a zombie thread? The other posters were from 3 years ago.....

But in answer to your question, your timings sound good. As other posters have said, ovulation is usually about 24 hours after first positive OPK, and sperm live for about 5 days.

However, even if timing is perfect, there is only about a 1 in 4 chance of conception. This is because of all sorts of things like egg quality, failed implantation, very early miscarriage etc.

Do a pregnancy test 15 days after you think you ovulated. Good luck!

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