Sensitivity to smell

Alright I'm losing my mind. I refuse to google this because I know the majority of articles will say pregnancy. For the last week I've been randomly feeling nauseated and very sensitive to certain food smells and it's driving me nuts because I've never experienced this before. Can anyone tell me any reasons they've had this before OTHER THAN being pregnant? Could it just be from the new birth control?
(Got Mirena removed on 9th, started pill right away the 11th so I would be shocked if pregnancy was the reason)