Reference: Fataawa az-Zawaaj wa ‘Ishratun-Nisaa. – Question 73, Page 104
Question: Is it permissible to have sexual intercourse with the wife whilst she is pregnant? And is there any evidence in the Qur.aan and the Sunnah which indicates a permissibility or impermissible for this?
Response: It is permissible for the man to have sexual intercourse with his wife whilst she is pregnant, as Allaah (Subhaanahu wa Ta’aala) says:
{Your wives are a tilth for you…}, [Soorah al-Baqarah, Aayah 223]
And the evidence is His (Subhaanahu wa Ta’aala) saying:
{And those who guard their chastity. Except from their wives or that their right hands possess…}, [Soorah al-Mu.minoon, Aayah 5-6]
So the statement {Except from their wives} implies the basis for a man seeking satisfaction from his wife is permissible in all cases. However, that which occurs in the Qur.aan and the Sunnah in terms of an obligation to keep away from the woman is a general prohibition, so it is not necessary to seek evidence as to the permissibility of sexual intercourse with a pregnant wife, since the basis is permissibility.
And it is not permissible for a man to have sexual intercourse with his wife via her vagina when she is on her menses, however, it is [permissible] for him to seek enjoyment with her in everything other than the vagina.
And it is not permissible for him to penetrate her in her anus because that is the place of excrement and filth.
And it is not permissible for him to have sexual intercourse with her if she is in the state of postpartum bleeding. However, if she is in a state of purity from her menses and postpartum bleeding, then it is [permissible] for him to have sexual intercourse with her, even if she becomes pure from her postpartum bleeding before the completion of 40 days.