I won't try to hide but figuring your way around pregnancy is mighty scary! especially if its your first (worse if you're a hypochondriac like me). For starters, when you first discover that you're with child, we're conditioned to not chat about it till much later. 
I found it especially difficult dealing with all my question in a foreign country with little help... every few seconds i wanted to ask "can i eat sushi?", "am i allowed to swim?", "man i really miss tea..." so i wrote to Wyna from Allerines asking if it was ok to drink tea. 
Here are some links she shared with me. 
  • In general, caffeine should be avoided during pregnancy. so many mums to be turn to herbal teas, and first on the list usually is chamomile, but in fact this is one of the teas that is not recommended during pregnancy. | source |
  • Rooibos has no caffeine and is low in tannin, so it can be enjoyed all day long without any unpleasant side effects. This also makes it a great tea for pregnant women and nursing mothers
  • You can consider steeping your tea for a shorter time for a lighter blend or replacing some of your favorite blends for decaffeinated and a guilt-free afternoon drink.
  • Herbal teas can be a good replacement for black tea but be a little careful of what's in the blend for example rosemary, sage, anise. | source
In my first trimester, after confirming with my doctor, I was given the green light to sip on ginger tea, Korean corn tea and "spiked" my green teas with a splash for lemon juice for a twee bit more vitamin c. They really helped me tide over the difficult days. but everything in moderation i guess! :)
Hope it helps!
Credits to Zhing - Little Projects in Style

Some of the naturally caffeine free tisanes that are recommend during pregnancy are: