It is in the unsafe list of most sites. Babycenter put together a strict list: https://www.babycenter.com/0_herbal-teas-during-pregnancy_3537.bc
From what I remember when reading about the tea when I was pregnant with our son was that it helpes tone the uterus so im not sure what harm it would do?
It is usually only recommended in the third trimester since it stimulates the uterus. Some sources say it can lead to miscarriage early on.
I had a sore throat earlier this week and my gyn told me to drink tea. I was shocked as I read certain teas had negative effects (like passion fruit causing contractions) so I asked her. She said stick to non-caffeinated tea. That berry flavored or herbal teas are fine. Chamomile, lemon, ginger....
So I ended up getting organic lemon ginger and organic chamo. I'm only using them when I am sick though.
Lemon grass and ginger are both not considered perfectly safe, or only in teeny amounts which sadly most teas exceed. Chamomille is another tea considered unsafe according to most sources and if recommended only in small amounts.
Also most berry teas contain hibiskus which is one of the unsafest choices out there. I was unable to find a berry tea without it.
I also found this site quite interesting but idk how well it translates: https://www.hebammenwissen.info/tee-in-der-schwangerschaft/
Every ingredient is analyzed though.
Teas are based on herbs and plants I have used herbs for healing and they are powerful. What may be good for your health normally might be a bad in pregnancy.
Until I saw an embryo I actually avoided all teas and stuck with juice. Then I began drinking fennel tea which is one of the safest teas and roiboos which is pretty much THE safest tea (get a high quality brand though, cheap redbush tea tastes horrible).
Now that I am closer to the second trimester I also drink peppermint tea and the occasional green tea (very rare).
I still avoid caffeine for the most part because of the recent criticism on the 200mg limit a day...which is very high and some studies show problems even with smaller amounts. Decaf tastes perfectly fine too for the occasional cup and one can wean off needing caffeine for fuel....so it is easy to cut it out.
One problem with decaf would be the chemicals that go into it while removing caffeine. Studies however showed no increased risk but I think it would be good to only drink it occasionally.
I alternate between teas and the occasional cup of decaf.