I don't think you should joke about murdering an unborn child, ever. It's revolting.
Can you imagine the conversation in the future? “Well, Suzie, your Daddy and I didn’t know if we wanted you so you know what we did? We put up a website and we allowed people to vote whether we would abort you or not. For a while there, we didn’t know what we were going to do”. Messed up beyond belief.