how exactly do you use an ovulation test as a pregnancy test?

posted 2 years ago in TTC
Post # 2
Member
1268 posts
Bumble bee
  • Wedding: October 2014

…what?

An OPK predicts when you get your surge and are about to ovulate. 

A pregnancy test measures HCG in your urine to determine pregnancy. They are very different. If you want to pee on a stick to see if you’re pregnant an OPK won’t help you. 

Post # 3
Member
2908 posts
Sugar bee
  • Wedding: June 2013

araneidae:  I know a LH test will react to the presence of HCG, but I don’t think there’s necessarily a way to tell whether the dye is reacting to LH or HCG. If you’ve already taken a pregnancy test, then you’re pregnant! Congrats! Stop peeing on things! 😉 

Post # 5
Member
1636 posts
Bumble bee
  • Wedding: September 2013

I’ve heard the same thing, but I’ve also read plenty of stories where people were pregnant and the OPK was still negative. So it doesn’t always work. But from what I understand, the OPK has to be positive.

Post # 7
Member
1268 posts
Bumble bee
  • Wedding: October 2014

araneidae:  in a quick Google search I only found similar message boards asking about it or claiming it could be true based on what someone’s doctor had said… not saying it may not be true.

I would still just go to the store for a pregnancy test if you need to keep peeing on sticks! 😉

Post # 9
Member
1348 posts
Bumble bee

To completely blow this theory out, I tested very very strongly positive on 8DP0 on a HPT but very negative the day before (no line even visible) on an OPK. 

Post # 11
Member
502 posts
Busy bee
  • Wedding: September 2012

This is how I found out I was pregnant last fall.  I had gotten what I thought was my period (but very light), and started opk testing for the next cycle on about CD 9.  I never ovulate til at least cd17 so I don’t know what I was thinking.  I have a poas obsession too.  🙂  But on that first opk on cd 9 I got a glaringly positive, like quite a bit darker than the control line.  I knew there was no way I was ovulating yet, so I did a pregnancy test.  It was positive, but not really really positive.  About half as dark as the control.  It ended up being ectopic (I should’ve known something was wrong due to the “period” and such a light test at 18dpo, but it was early in my ttc and I was a bit clueless).  But I am one source of “proof” that an opk can show pregnancy! 

Post # 12
Member
7674 posts
Bumble Beekeeper
  • Wedding: August 2012

I don’t think this is a very accurate method. Why can’t you just get a pregnancy test?

Post # 13
Member
1241 posts
Bumble bee
  • Wedding: October 2013

Westwood:  +1.

Yes, LH and hCG are similar enough to have some cross-reactivity on the respective tests, thanks Google. But the odds of a false negative on the OPK are high enough, why wouldn’t you just buy the product designed to answer the question you have? Signed, analytical chemist.

Post # 15
Member
1241 posts
Bumble bee
  • Wedding: October 2013

araneidae:  Ok. Sheesh away, but you asked for advice on how to use an OPK as a pregnancy test, and my advice was, don’t. I know it’s hard to stop POAS after getting a BFP, but for sanity’s sake, step away from the tests 😉 Congratulations and enjoy your pregnancy!

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