Re: What teas are safe?
Elderberry syrup helps with colds and is safe for pregnancy. Raw garlic is also good (eating lots can cause stomach upset, so don't go too crazy) or you can infuse some into olive oil (put chopped garlic and olive oil in a glass container in a pan of water and heat gently on the stove for 20-30 mins) and rub the oil on your feet.
The chamomile and echinacea should both be fine. Without knowing what's in the other one its hard to say.