19w+5d started smoking again

Im pregnant. I quit cold turkey when i found out and i was a heavy smoker.

My parents have their grand daughter staying with us and im beyond stressed. Shes a bad child.

Everything was fine and i didnt have cravings or too much stress before this. But I've picked up the habit again for about 2.5 weeks now. Definitely NOT as heavy as before. Maybe 2-3 cigs a day. But i feel sooo freaking guilty. My doctor amd everyone else says that amount of smoking is less harmful to the baby than stressing all the time. And my recent ultrasound was fine. I just still feel like a big pile of shit for this and cant seem to fight the urge to light up.

Anyone have experience smoking while pregnant? Ive been avoiding the stressors in my home as much as possible by staying in my bedroom for the last month. And the child that is here is leaving on friday this week. So my smoking will probably stop very soon after that.