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should be the same, no difference
Wow, you really need to work on your understanding of human psychology. Her entire situation is changed as a result of being pregnant, so there's definitely going to be different things she's looking for in a man.
It depends on whether she's in a relationship and you're trying to get her to cheat (which I don't advise, but it deserves mention obviously) or whether she's single and plans to take care of it herself, she's looking for a new guy to help her take care of it, she's got her family to help her, she's planning on giving it up, etc. It also depends on where her mindframe is, whether she's looking for a little bit of excitement before becoming a mom and settling down, or whether she's trying to live responsible and acting like a good parent already. There's a lot of factors to take into consideration.
Just like any girl you want to pick up, you need to determine what she wants and give that to her.