Certainly not!
why to kill someone cause of any possible situation, there's someone livin, breathing n nobody has the right to abort it.
If the kid is declared abnormal or has any kinda problems, this is no solution, because u are no one to give or take life, leave things to Lord, if thats is how it's destined for him/her will happen so...
n forget not, miracles do happen =]
n about the other side, if the baby is biological, u still dont have to kill it, cz of ur own mistakes and strayness and fear of embarrasement and this-respect, the kid must not be the one to suffer, the person givin birth must suffer for the doings. That's more of a very bad punishment.