A pregnant cow is simply called a cow. The term "cow" refers to a female bovine animal that has given birth.
Here's a breakdown of the terminology:
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Heifer: A female bovine animal that has not yet given birth.
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Bred Heifer: A heifer that is pregnant for the first time.
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Springing Heifer: A heifer in the final weeks of her first pregnancy.
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Cow: A female bovine animal that has given birth. Therefore, a pregnant cow remains a cow, regardless of her pregnancy status.
So, while there are specific terms for a young female before she has calves, once she's had her first calf and is therefore considered a cow, she's still called a cow whether she's currently pregnant or not.