Limbs don't happen until second trimester. Well, they are there, but don't really look like limbs, and certainly can't be used for swimming. It wasn't self-aware, and it can't feel or see anything. Large fetuses are a minority of abortions, most are tiny. Peanut size, because most people get them as soon as they find out. In the amount of time it takes a woman to miss her period, the fetus is just a tiny collection of stem cells.
Those large fetuses were probably shown just to make it look more human in a propaganda film. Those are usually aborted because the baby is causing serious health problems for the mother, but of course a propaganda film won't mention that, they want you to think that's what all aborted fetuses look like.
This is what a fetus looks like at 2 months, which is when most are performed.

It's smaller than your thumb, has little to no organs, they eyes don't work, there is little to no brain matter, no skin, no nerves... It's mostly still stem cells.
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