Hi OP, just to add to the above replies, I'm now 38+4 and have been on citalopram throughout the pregnancy, though I did reduce my dose from 20mg to 10mg. Like you, I worried about it a lot at first, and raised it with every midwife I spoke to (I've seen 3 different ones). All of them were very strongly in favour of me staying on it, and said they'd seen a lot of pregnant women on citalopram - they were very chilled about it, and said they would be more concerned about me coming off. I found that very reassuring. My depression and anxiety have only ever been mild to moderate, so in some ways I could probably manage without citalopram, but I know (from bitter experience) that I'm much happier and healthier on it. And pregnancy is, for many of us, quite a tough ride anyway so I didn't want to mess around with my medication. I
also spoke to my GP, who consulted a psychiatrist about the risks/ benefits of citalopram in pregnancy, and their combined advice was also to stay on it.
I did later speak to a different GP (who i'd never met, and it was a phone consultation) when I had a med review, who said it would be better for me to come off it, and I said, 'But what happens then, when I get depressed again?' and he seemed to panic a bit, and said not to come off it without speaking to my midwife. And she'd already said to stay on it... So all that felt a bit circular.
There's some conflicting advice and IME GPs tend to be more cautious than midwives/ obstetricians. Worth bearing in mind that GPs seem to consult a blanket list of indications for each drug, which seems to me quite a blunt instrument since this guidance doesn't seem to provide any detail on level of risk (I asked about level of risk during that second GP conversation and he said 'It doesn't say'), whereas obstetricians and midwives have seen the impact of citalopram/ no citalopram in practice.
I've read the available studies online too, and my takeaway is that there is a very slightly elevated risk of heart defects in your baby if you take citalopram throughout the first trimester but a) the increase in risk is extremely small, and b) the absolute risk also remains very, very small. Equally, i read that there's a (very slight) risk of breathing difficulties in the baby after birth if you've taken citalopram in the third trimester, but when I asked my midwife about that she said theoretically yes, but she's never actually seen it in babies born to mothers on citalopram, and all it would mean would be the baby gets a bit of extra monitoring for a few days. (It's not a permanent condition.)
So: I concluded from my research that there are some risks, but the level of risk is very low, and all this has to be balanced against the impact on the baby of a depressed/ anxious mother - all those stress hormones. So I made the decision to stay on citalopram, and for me it's felt like the right one. (Baby is merrily kicking away as I type, and all scans have been fine.) It's not easy, because of course you want to do everything perfectly for your baby. But there's no such thing as a perfect, risk free pregnancy. There are so many variables and many other things that can go wrong, so for me citalopram has been a very useful crutch.
Hope some of this helps! Good luck with the pregnancy.