Smoking MJ

I'm 31 weeks pregnant and I've been beyond nauseous the last few days and I haven't been able to eat anything. My mind keeps going to taking one hit of weed to see if that helps and then I'll be able to get and keep some food down.. is this a bad idea? Will taking one hit harm my baby? I obviously don't want to cause any harm to her I just want to be able to eat and give her some nutrients and feel good because this is killing me. I haven't smoked at all since the very beginning of my pregnancy and as soon as I found out I quit immediately.