Possible septate uterus - but 2nd baby and never flagged before?

[salt525]

I'm hoping someone with experience of this can help me please.
I'm currently in the early stages of my 3rd pregnancy (have 1 DC, 2nd was an early loss). I went for an early scan on the NHS this week due to my previous loss and the doctor suspected that I have a subseptate uterus. He's referred me for a 3D scan in a couple of weeks to investigate further.
What surprised me is that I've read that a subseptate uterus is a congenital defect and therefore something that, if I have it, I would have had my whole life. It therefore seems unlikely to me that not one sonographer would have picked this up in my 1st pregnancy (during which I had 5 scans). I asked the doctor if this is something that can develop later in life and he confirmed that you're born with it. Has anybody on here only discovered they have a subseptate uterus during a subsequent pregnancy?
Thanks in advance for any info!

Not me personally but a lady on another forum had this. She also had a DS who was 7 unable to conceive after him tried for 5 years. Only then did a Dr pick it up. They did a HSG and the contrast really showed the full extent of it. She was very blessed to have had her son as the severity meant from a medical stance she shouldn't be able to have kids.
As far as I am aware there were no garunteed treatments not even IVF as where implantation occurs is not upto the Drs.

Sorry this is not helpful or what you wanted to hear. Maybe look on youtube for sucess stories

I have a bicornate uterus and it opens up at the end of the first trimester. So it wasn't spotted until a very early scan, missed in my first pregnancy before then

I also have a bicornuate uterus. It was not picked up in my first pregnancy but I believe it was the reason that pregnancy had placenta accreta. It was only spotted 8 years after when in my second pregnancy and they thought it was an eptopic. I also believe it’s the reason my second pregnancy stopped at 29 weeks and I had a preterm labour with dd2.

Did they say to what degree the uterus is separated? Did you even have scans prior to your 1st pregnancy? When was your 1st scan with the 1st pregnancy? If the scan was a 12 week one, I assume they were concentrating on the foetal scanning and not the uterine shape. In later scans, the separation might have been pushed over, and not so obvious on scans.

I'm sorry for your loss OP. My friend had an MC and it was the 1s time she was aware of a bicornate uterus. Drs told her that the cause was the foetus becoming squished in the corner of the uterus and not being able to grow properly. She did then have 2 healthy babies, but had more scans than a regular pregnancy. Wishing you all the best OP x

@SM4713 Thanks so much. 1st scan in 1st pregnancy was at 6w+5 and everything was normal, hence why I am surprised. No scans prior to 1st pregnancy. They couldn't tell me any more and referred me for the 3D scan to investigate (which is happening in a week's time). Guess I'll have to wait and see what comes of that!

Thank you everyone for your replies, really helpful 🙏