I feel so nauseous

Someone please help. I feel like I'm gonna pass out. I'm ttc. 9dpo but if I am pregnant it's still early days. I've been cutting down on smoking, trying to quit. Went from 25 a day to 4. That's in the last week. Could that cause it? Don't think I've eaten anything bad, me and my husband ate the exact same today. He is feeling normal. I feel like I'm gonna pass out. It was just so sudden. Any reason why? Please and thanks