Early in a pregnancy, "normal" ultrasounds (the ones you see in TV shows where they put stuff on the belly and push the wand over it) aren't sufficient to see anything. The first ultrasound a woman gets around 6 weeks in is usually trans-vaginal for this reason. Which isn't to say they aren't being evil. If a woman is seeking an abortion, the proper medical care is an abortion. It's not much more complicated than that.