Prior to pregnancy botox is fine! Botox has not been studied in women who are pregnant, however, many of my patients have had treatment without knowledge of their pregnancy and had no issues. If you have any concerns, follow up with your OB/GYN. Best, Dr. Emer
Having Botox one month before finding out you were pregnant should not have an effect on your pregnancy. I would just mention this fact to your obstetrician though.