Exactly how soon into pregnancy can you have a strong sense of smell?

Hazel • 29 years old. Libra. Mother of TWO now :)
I'm trying hard not to make myself think every sign could mean I'm pregnant. My period shouldn't be here until tomorrow so it seems too soon to be having a stronger sense of smell already. But i'm experiencing this for a week now even I am in the room and going inside the blanket. Lol! Weird!