Hadith.4794 - Ali ibn Al-Hakam narrated from Muhammad ibn Mansur Al-Sayqal, from his father, from Abu Abdullah (as) regarding a man who divorces his wife while she is pregnant.
Imam (as) said
"He may divorce her."
I asked: "Can he take her back?"
Imam (as) replied: "Yes, he can take her back."
I asked: "What if he decides to divorce her again after taking her back?"
Imam (as) said: "No, not until she gives birth."