Usual Smoker, Not Anymore..?

Okay, so usually I smoke around 3-5 cigarettes a day. I would say I'm addicted but I'm not smoking a pack a day yet. Lately, whenever I go outside for a smoke, it just makes me feel nauseous all of the sudden. I'm eating a lot more, sleeping a lot more, I pee a thousand times a day it seems.. I haven't had a period in 60 days but that's because of the BC I'm on. Me and my boyfriend have unprotected sex (meaning he cums inside me) almost daily (sometimes more than once a day) and some days I'm so busy that I'll be late for my pill or skip that day completely. Is there any chance the sudden change in smoking/eating/sleeping habits could mean pregnancy?