[Mommytobe92]

Hiya all, I've been checking FF chart gallery and some BFP charts show positive hpt at 7dpo and some only shows + only at 13 or 14dpo (some even later). Why do some women get early positives and some later? Does it mean that the hcg level rises at different rate for every women ?? I'm suspecting that those charts which show late positive is because the women test late, it's not because it was tested negative at 7dpo, right? Wdyt? Have there been many cases where it was negative at 15dpo and then suddenly it was positive at 16 or 17 dpo?

I've been searching the web for any articles about hcg level and why it shows up early or late on HPT and I couldn't find any articles like that. Anyone knows of any info or website to share? Info like, what is the % of women who gets BFP at 7dpo and what is the % at 8dpo, etc.. data like that is not documented, eh ((hmm, why would anyone do this kind of survey ?))

Any personal experience and input is appreciated. Thanks.
P/S: When is the earliest dpo that you got your BFP?

[PuzzledAngel]

I don't have articles or precentages but the reason that some women get a + eariler then others is simply because we are all different.
Our bodies are different and each pregnancy is different. You could get a + at 8 dpo for one pregnancy and not get one till 15 dpo for another.

I did find this site which says
"HCG is detectable in the blood serum of approximately 5% of pregnant women by 8 days after conception, and in virtually all the rest by 11 days."
article about hcg levels
However, MANY women do not get a + untill after the 11 dpo so I don't know how valid the article is.

There is a "normal" range of hcg levels for each week of early pregnancy
3 weeks LMP: 5 - 50 mIU/ml
4 weeks LMP: 5 - 426 mIU/ml
5 weeks LMP: 18 - 7,340 mIU/ml
6 weeks LMP: 1,080 - 56,500 mIU/ml
7 - 8 weeks LMP: 7, 650 - 229,000 mIU/ml
9 - 12 weeks LMP: 25,700 - 288,000 mIU/ml
13 - 16 weeks LMP: 13,300 - 254,000 mIU/ml
17 - 24 weeks LMP: 4,060 - 165,400 mIU/ml
25 - 40 weeks LMP: 3,640 - 117,000 mIU/ml
Non-pregnant females: <5.0 mIU/ml
Postmenopausal females: <9.5 mIU/ml

So following this chart, at 4 weeks LMP (taking into concideration they assume you are O'ing on CD14) you would be
14 DPO. At this point, your HCG levels could range anywhere from 5 to 426 mIU.
Pregnancy tests range in sensitivity anywhere from 25 to 100 mIU.
So you could be pregnant with a low HCG of 15 mIU and no tests would pick it up.
You could be pregnant with an hcg level of 30 and one test will give you a positive but another will give you a negative because it doesn't pick up the HCG level until it has reached 75mIU.

All that said, even the "Normal" hcg levels are not set in stone. Many women have "off" levels and go on to have healthy pregnancies........

[diznynurse]

Nicely said PuzzeledAngel. My 2 cents are this. When I stalk charts that get a +at 7dpo, I'm actually wondering if they O'd earlier than FF says so they would essentially be later dpo (kwim) also all depends on the brand of test you are using. Some are more sensitive than others. Peeonastick.com has a good list of sensitivities.

[~Jess~]

The body does not produce hcg until the embryo implants in the uterus. Some will implant at only 6 dpo, and others at 12dpo. They vary from woman to woman and pregnancy to pregnancy. Once the egg implants, then the hcg starts to build up, again the levels vary from woman to woman and pregnancy to pregnancy. Most pregnancy tests detect in the 20-100 mIU range.

I've gotten negative HPTs at 9, 10, & 11 dpo, and then gotten a BFP at 12dpo.

[NutMeg76]

I agree with the responses already provided. I really think that super early BFPs are often where FF miscalculated the O day. HOw many times do we see that, where FF changes CH? It happens ALL the TIME!!!

Also, there is that fact of the variation in implantation. If two women O today, but one doesn't have implantation until 7 days from now and the other implants 10 days from now, one would get a BFP at 8-9 DPO, where as theother would get it at 11-12 DPO.

[Mommytobe92]

Thanks for all your replies. I tested today at 13dpo and it was negative, but I'm still keeping my fingers and toes crossed. I'm hoping tomorrow will be a positive or I'll wait till 16 or 18 Lp days and hopefully, it will be positive by then . (((Pray)))

P/S: I dun wanna be a poas addict...

I saw my first positive at 7DPO and you all know ladies I dont O before CD18 if I do it was lucky. I really think I did O CD20 this past cycle. I think it all depends on the baby implants as well, some do it faster then others.

[Mommytobe92]

Hi PuzzledAngel, thanks for the link to the website. I got this data from that website, this is chart of the days from conception vs the hcg level.

Days from conception : hcg level (mIU/ML or IU/L)
7 days : 0 to 5
14 days : 3 to 426
21 days : 18 to 7,340
28 days : 1080 to 56,500
35 - 42 days : 7,650 to 229,000
43 - 64 days : 25,700 to 288,000
57 - 78 days : 13,300 to 253,000
17 - 24 weeks : 4060 to 65,400
25 wks to term : 3640 to 117,000

I guess some embies decided to implant early and some late . I think the earliest an emby can implant is 6 days past ovulation or could it be earlier than that?

Magan, you're a lucky girl, you tested for early positive. I read somewhere and it says high hcg is because of twins pregnancies.

SHHHH dont say that! I would LOVE it but DH not really! I have the pic of my FRER IC and Fact plus for 7DPO. Thing is I didnt get a digital to say PG until 12DPO. I guess I could have gotten it before but didnt test until then.