Vanishing twin or ectopic pregnancy...what were your beta HCG levels? — The Bump
Pregnant after IF

Vanishing twin or ectopic pregnancy...what were your beta HCG levels?

Hi everyone.  I’m 6w pregnant today after a FET.  We transferred two blasts.  My betas this pregnancy so far have been:

4w1d - 156
4w3d - 278 (58 hour doubling time)
4w5d - 518 (56 hour doubling time)
5w1d - 1377 (52 hour doubling time)
5w5d - 1619 (only up by <300 in 4 days 😨)

After this last beta, my RE basically said the two possible scenarios are either ectopic pregnancy or a vanishing twin.  We have an US tomorrow to find out what’s going on.  Has anybody experienced betas like this?  If so, what was the outcome?  If you have had an ectopic or a vanishing twin, were your betas similar?  I’ve just been a mess all weekend and I’ve been scouring the internet for good outcomes in situations like this.  I’m not having any pain or bleeding.

thanks for your input!

Re: Vanishing twin or ectopic pregnancy...what were your beta HCG levels?

  • I had a vanishing twin @ 8 weeks

    #1 304  9dp6dt
    #2 585 11dp6dt
    #3 2020 14dp6dt
    #5 5157 17dp6dt

    BUT our vanishing twin was later on -- 8 weeks. We had two sacs and heartbeats at the first scan so that's likely why it kept doubling. I think you'll know more if they do a scan.
    ~~ Our Story in Spoiler! TW loss/child~~
    Fall 2012 -- started TTC
    Summer 2015 - no BFP yet, labs normal, referred to RE
    Fall 2015 - Summer 2016 - Further testing all normal. 3 IUI's -- BFN. Recommended move to IVF. Planned cycle for fall 2016.
    September 2016 - Surprise natural BFP. MMC @ 8 weeks. RE expressed confidence that we just needed the 'right' embryo.
    Fall 2016 - Spring 2017 -- Break from TTC
    June 2017 - Started IVF; egg retrieval for freeze all cycle. 9 mature eggs retrieved, 5 fertilized. 2 4BB embies on ice.
    August 2017 - FET transfer both embies. BFP.  Twin pregnancy confirmed by ultrasound. EDD 4/28/18
    September 2017 - Twin B stopped developing; Twin A doing perfectly! Graduated from RE @ 10 weeks
    March 2018 - Baby Girl born via C/S due to pre-eclampsia -- strong and healthy!

    TTC #2
    January/Feb 2021 - Freeze-all IVF cycle 
    March 2021 - FET of 1 PGS normal female embryo. BFP! Beta #1 156,  #2 472, #3 1241, #4 5268 EDD 12/5/21 - Christmas baby!


    "When all is lost then all is found."


  • Thank you for your response.  My ultrasound showed nothing today, in the uterus or the tubes.  Just waiting for more bloodwork now to see if it’s resolving itself or continuing to grow somewhere and we just can’t see it yet.  But there should have been something visible on the ultrasound at 6w1d, so we were basically told there’s no chance of a viable pregnancy.
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  • dukie001dukie001 member
    edited May 2019
    I had a vanishing twin too @ around 8wk. We saw 2 heartbeats at 7wk u/s and there was no heartbeat or fetal pole at 9wk u/s. But I didn't get HCG checks at that point. Before u/s, my HCG always more than tripled. 

    I'm no expert by any means, but I think with your HCG numbers they should see at least a sac. 
    Hope everything resolves in a good way.

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