Pregnancy and smoking

I have my medical card for migraines and I and I’m four weeks pregnant, I wasn’t trying to get pregnant so I’ve been smoking the whole time. I also smoke for anxiety so I’m pretty much an all day every day user. There’s so much conflicting information out there on if it’s safe or not and I’m just not sure if I should quit, my nausea has been unreal. Any mothers out there who smoked while they were pregnant and have some advice to give? Thanks