Oh, a yes/no answer to this question would definitely be a spoiler. What I can say is that the signs of pregnancy are unlikely to show themselves at such an early stage (we're basically talking 2-3 weeks of pregnancy at this point of the story, tops). And yet, even though it's unrealistic, in a couple of places the game does “hint” to the player that Selene is pregnant. This is where it's still worth considering whether Selene has taken some, well... measures. Or not. Because if she did, there might not be any consequences, you know... eventually. Hidden random checks will decide this.