My doctor told me that standard nail polishes contain chemicals like toluene and phthalates, so it's best to look for '3-free' or '5-free' non-toxic brands. Also, always apply it in a well-ventilated room.
Since I had a long journey with PCOS, I became extra cautious about endocrine disruptors. I avoided applying them frequently, maybe just once for a family function, and kept my nails natural most of the time.
Mummy and dadi used to say we should avoid strong chemical smells during pregnancy. So I only applied natural organic ones during the baby shower and kept my nails clean otherwise.
Ghar pe simple, local brands use karne ke bajaye thoda achha branded, chemical-free nail polish le lo. Aur lagate waqt fan on rakho taaki smell na aaye, simple!