Can you get Botox while pregnant?
This is a question where a missing line in the documentation matters as much as a printed one.
No rule stated here
This page does not state a rule for pregnancy. It is a question to put to a licensed clinician, with the product's current documentation in hand, before any injection. Tell the provider about a pregnancy, a possible pregnancy or breastfeeding at the start of the consultation.
Silence in a source is not clearance
A confident yes or no from a marketing page is a claim to check against the footnotes. The sources below are the ones to read for how each describes the product. Note whether each one addresses pregnancy directly, stays silent, or points back to a clinician, because silence is not the same as clearance.
The ASPS page on the botulinum toxin procedure and the ASPS article answering common Botox questions come from a plastic surgery society. The ASDS page on neuromodulators is the dermatologic surgery view. The MedlinePlus health page on Botox is a public health-information view. Compare how each handles the topic.

Raise it before you book
Raise pregnancy or plans to become pregnant before booking, not at the appointment. Ask the provider what the product's documentation says on the subject and ask them to show you. If you are already receiving prenatal care, mention the question to that clinician as well.
This decision sits with your clinician
This site compares how sources word a product and offers no medical advice, so a licensed clinician who knows your situation is the right source for this decision.