Levels + Cycle numbers not adding up

posted 3 years ago in Pregnancy
Post # 2
2419 posts
Buzzing bee
  • Wedding: April 2014

mrsbays913 :  Well, you realize that gestational age is based on the first day of your last period, yes? However, true fetal age refers to the day of conception – so you likely did not ovulate until closer to CD 55/60 making you just now about 4-5 weeks pregnant. In a “normal” cycle, ovulation is 14 days after the start of your period, so by the time you get a positive HPT you are “4 weeks gestation” +. In longer cycles, this is why it is important to track ovulation, so you can get an accurate time frame for when you conceived.

When you have your first ultrasound you will get a due date based on the size of the embryo at that time.

ETA: your HCG levels are much closer to that of 4 weeks. A beta HCG above 5 is considered pregnant. Implantation occurs at the earliest 6 DPO – and doubles every 48-72 hours. Just going off those calculations, it is safe to say your fertilized egg probably implanted around 3/6 or shortly thereafter.

Post # 3
262 posts
Helper bee
  • Wedding: August 2013

mrsbays913 :  I dont know anything in particular about levels however, if you have irregular cycles due to PCOS, chances are you just ovulated later than you thought. Unless you were temping/using OPKs and you confirmed the ovulation date, i wouldnt be surprised if you conceived later than 14 days after your last period. 

Post # 4
9385 posts
Buzzing Beekeeper
  • Wedding: August 2012

If you were on CD70 you can’t use your LMP for gestational age. That’s only accurate if you ovulated on a typical day ~14 which is highly highly unlikely for you.

Request a dating ultrasound if they didn’t offer one.

Post # 6
2419 posts
Buzzing bee
  • Wedding: April 2014

mrsbays913 :  Unless you have an OB/RE tracking your ovulation and cycles, most will just assume you have a “normal” 28 day cycle with ovulation occurring around day 14..which is why they use LMP to “date” your pregnancy until an ultrasound proves otherwise. I’m surprised if your OB told you that your pregnancy was any more than 4 weeks at this point because of your HCG levels. If you haven’t talked to them about it, just mention that your last cycle was 70+ days and you would like a dating ultrasound after confirming your HCG continues to rise.

Post # 9
2021 posts
Buzzing bee
  • Wedding: September 2013

well obviously you’re not 10 weeks pregnant as you ovulated late due to you irregular cycles. they will adjust your due date at your first ultrasound. sounds like your numbers are great!

Post # 10
125 posts
Blushing bee
  • Wedding: November 2014

This happened with me.  I also have PCOS.  I didn’t ovulate until somewhere between CD 40-42.  I got my first very early BFP on CD 50.  I was keeping close track so I was able to explain the long cycle to my OB.  Ultrasound confirmed that I was spot on with my ovulation / conception dates and used those to date the pregnancy.  I am now 22 weeks pregnant with Dear Daughter :).  Congratulations bee!! 

Post # 11
2853 posts
Sugar bee
  • Wedding: September 2012

mrsbays913 :   It’s automatic for doctors to go by your LMP to calculate your EDD until proven otherwise (with a dating ultrasound). With my son I ovulated on CD19 so was 5 days behind where my doc thought I was, and despite my telling her numerous times that I knew exact fetal age she went by my LMP until my US at 9w5d (by ovulation) showed that I was exactly 9w5d. I expect the same this time – by ovulation I’m 5w1d (I ovulated on CD23), by LMP I’m 6w3d – and my doc will go by LMP until a dating US proves me right. Don’t sweat it!

Post # 12
755 posts
Busy bee
  • Wedding: February 2016

Have a dating scan. I’d say you’re prob around 5 weeks and have ovulated much much later than CD15.


Leave a comment

Find Amazing Vendors