Posted: 07/10/2013 at 06:33
There's a recent discussion about Mare's tail here
I can't advise whether it's safe to use herbicides when pregnant - I would say that for peace of mind it would be best for someone else to take on weedkilling duty and for her to stay away from the marestail until the chemical had dried on the plant.
The second plant - is it Euphorbia lathyris (Caper Spurge)?
If so, it's fine if left alone, but the milky white sap can cause burns to the skin and would be very painful if it got in your eyes.
Or is it not this one?