You could have been going through THC withdrawals, sounds eerily similar to the ones I experienced after quitting cold turkey for a bit (also a heavy smoker). After quitting (for a couple weeks/month or so) I’d be super nauseous and could not keep food down for the life of me (despite feeling extremely hungry), I lost a bit of weight during this time. My appetite didn’t necessarily return to normal until I began smoking again roughly 2-3~ months later.

At the time I was heavy into using dab cartridges, which had a higher concentration of THC and had been reliant on them (going through one g every 3 days or something ridiculous). I know it sounds silly initially, and I myself didn’t believe in weed withdrawals until I experienced them. I also experienced sweaty palms, cold shakes, extreme irritability, etc. I quit the cartridges for good, and only smoke physical weed now because of this. I’m sorry you went through this during your pregnancy, it doesn’t sound like you’re a bad person and you were only trying to help yourself/your baby.