Do you think its okay to go party while youre pregnant

There are a lot of girls on my Facebook who go out while they're pregnant. They go to parties, raves, clubs, "cruising" (driving around with friends and socializing with other people who are doing the same). I think most of them don't drink or do drugs but a few of them do... Some of them even have sex with random people. Do you think it's ever okay to do these types of things while pregnant? Even if you you're sober? Or with friends? (Comment your full opinion please)