I had Botox last week and found out that I am 5 weeks pregnant. Did I harm my baby?

Botox administration is not advised during pregnancy although this is a common scenario. Ensure you do not have any further Botox treatments. Congratulations! 

Thank you for your question. I would not worry too much if you had Botox and found out you were pregnant. Botox works locally where it was injected and the dosing is very small. The makers of Botox would never consider sponsoring a study to see the safety of Botox during pregnancy or breast feeding as it would be too risky for them. Likewise, for physicians. I generally provide reassurance for situations like yours and I do recommend that you stop any future injectable treatments until either the baby is born and after breast feeding. I would also let you OB know that you had a Botox treatment during pregnancy so they are aware.

Botox has not been studied in pregnancy, so we don't know what the effect is. However, the concentration is very small and the injection is so localized that the likelihood is very low that you harmed your baby.