Is all salicylic acid forbidden in pregnancy?

It is not accurate to treat every salicylic-acid product as the same exposure. The exact product, concentration, area, and frequency matter, so pregnancy advice should be individualized with the appropriate clinician.

Pregnancy guidance depends on the exact product and use

The AAD discusses limited use during pregnancy, with advice from your obstetrician or dermatologist. The exact product and how it is used matter. I would ask them to review it rather than give you a blanket yes or no on this page.