No its not safe. Any alcohol consumed has a chance of hurting ur baby, drink apple juice instead.
I wouldn't risk it, but if you want medical advice about it, talk to your doc/midwife. Honestly one glass of champagne probably wouldn't hurt anything, but is that a risk you're willing to take? Personally it's not one I would take, but you need to talk to your doc and do some research of your own and make up your mind about it.
Have a sip or 2, I wouldnt drink the whole thing. I have my brothers wedding in May and I plan having a few sips.
You can still toast with water. It's the thought that counts. However, some doctors do say a little wine won't hurt anything. I would ask your OB. Just a sip for a toast would have hardly any alcohol. I have still taken Communion at church my whole pregnancy.
Most definiltey not in the first trimester AT LEAST..