From googling, I've concluded that only water, peppermint, ginger and decaf teas are completely safe.
I bought a lovely yogi tea (Alkaline herbs) https://www.yogitea.com/en/products/yogi-tea/alkaline-herbs/ but then read that the citral lemongrass can cause birth defects. And all my other teas have liquorice root in them (small amounts). No-where on the internet does it say how much constitutes a danger, as these teas are all blends so no one herb concentrated.
However, the NHS website says that herbals teas , one or two a day, are probably safe. Also, I found a pregnancy tea that contains lemongrass.
Has any-one found herbals teas that are safe? Or drunk these teas anyway.