The hud helps you to simulate a pregnancy, it even let you set yourself pregnant, but as it is second life it is all simulated and a guide to help you roleplay and not actually needed in order to actually roleplay a pregnancy.
So if you're hud says you aren't pregnanct but you want to be - set it that way, if your hud says your having a boy and you want a girl... you can change the roleplay to suit what you want over the readouts from the hud.....
So in short, roleplay how you want and use the huds to enhance that roleplay.
if you dont want an abortion then don't roleplay that - only you can terminate the pregnancy in that specific hud with official doctors help, and they wont force you.