I've read the list of materials that California knows cause cancer and birth defects. It lists things that people encounter every day. Alcoholic beverages, aloe leaf extract and aspirin are some of the most notable examples from the "A" section.
I don't know about aloe extract, but pregnant women are also discouraged from taking aspirin.
Here's a random online store selling it, with a big warning for "usage during pregnancy and breastfeeding" (French only): https://lasante.net/nos-medicaments/douleurs-et-fievres/aspi...
Where I am, they all are known to cause birth defects. I never met woman with children that didn't take measures to avoid them (and a dozen of other products with similar effects) during pregnancy.
If you liken your bike to them, that's, uh. That's one hell of a bike. Probably should stay away from pregnant woman while riding it, huh