Most definiltey not in the first trimester AT LEAST..
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.
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.
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.
No its not safe. Any alcohol consumed has a chance of hurting ur baby, drink apple juice instead.