If this is a question about the Twilight lore, then yes exactly.
Cis vampire women cannot have biological children. Those who are equipped with the "wombs" will not be able to as a vampire. (In quotes because can we actually open up a sim to see if they have wombs?)
Canonically,--in the Twilight universe--human cis women and anyone equipped with wombs will very likely die when they give birth to the offspring of vampires that are equipped with a male reproductive system. Bella Swan, the protagonist of the Twilight series, nearly dies giving birth to Renesmee until Edward and the others save her with vampire venom, preparation, observation, tech, and some fast-moving.
But if you're asking about the mod:
Firstly, sorry about this long, probably unnecessary explanation.
Secondly, all questions about the mod go to my Suggestions page HERE. Otherwise, your comment will be deleted without a response. Something to remember in the future.
Thirdly, since I'm following canon Twilight, the same rules apply. In my mod, you can save your human birth-giver by turning them, but you're on a clock. If you don't turn them within 2 sim hours, they will die.