Sheikh Sâmî al-Mâjid
He should not fall into any suspicion. He should not be in doubt of his wife’s modesty without having clear evidence.
The blood seen by his wife could either have been menstrual blood or blood from a broken blood vessel. I believe that his wife got pregnant from him. It is not at all uncommon for a woman to continue to have normal menstrual cycles during the early stages of pregnancy. This is something well known both to women and doctors.
It is unjust for him to accuse his wife of something she did not do. Suspicion can never be used to accuse an innocent person. He should fear Allah and safeguard his wife. He should strive to uphold and defend her honor and dignity and refrain from levelling any baseless accusations.
And Allah knows best.
Source: Islam Today