In the name of Allah, the most compassionate, the most merciful.

One crime, one disease, one sin. That Satan has succeeded in driving a man into is the greatest and the most dangerous and the filthiest sin on the face of this earth is the sin of Zina. (Fornication)

A sin that destroys and shatters the homes. A sin that destroys good character, good behavior. That creates envy, hatred, jealousy, discord, the enmity between people. That makes the society as a whole collapse. That brings shame, an embarrassment to the family and relatives. That destroys all the relatives together. That breaks them up. And that brings or opens the doors to the worst diseases on the face of this earth. Diseases. Nasty Diseases. Like Gonorrhea, herpes Aids etc. And much more.
Moreover, it leads to unwanted pregnancies and thus abortions.
In Islam, Killing an innocent person irrespective of his age, gender or religion is prohibited and condemned. As 
Allah says in Holy Quran: 
“And do not kill the soul which Allah has forbidden to be killed except in the course of justice.” [al-An‘âm (6): 151]
Also, Our beloved Prophet Muhammad (saw) said:
 “The very first matter to be decided between people on the Day of Judgment will be the cases of bloodshed.” Al-Bukhâri (6471) from ‘Abdullâh b. ‘Umar (RA)
Having a child and praying for them to be righteous is considered to be an act of worship. Aborting them from coming into this world is prohibited. As we all know how Muhammad (saw) fought against female infanticide during his lifetime.

“And when the girl [who was] buried alive is asked – for what sin she was killed.” [at-Takweer (81): 8-9]
Also in Quran Allah Subhana-Wa-taala firmly prohibits us against killing our children for the fear of poverty.
 “Say: ‘Come, I will rehearse what Allah has (really) prohibited you from’: Join not anything as equal with Him; be good to your parents; kill not your children on a plea of want – We provide sustenance for you and for them- come not near to shameful deeds, whether open or secret; take not life, which Allah hath made sacred, except by way of justice and law: thus does He command you, that you may learn wisdom.” [Al-An’âm (6):151]
Rulings on an abortion.
A fetus is an origin of life. It is a miracle of Allah to create a life from a single clot and a womb is as sacred as it is a vessel that carries this miracle of Allah and brings it in this world. It needs to be cared for and safeguarding. Being able to have a child is a blessing of Allah subhana-wa-taala and a person must value this great favor of Allah before it is too late.
All praise be to Allah, Indeed He knows best.

1.       It is not permissible to abort a pregnancy at any stage. It is highly prohibited unless there is a legitimate reason.

2.       The first stage (First Forty Days): If aborting a fetus serves a legitimate purpose or will be done to avoid any harm then it is permissible to abort it. But aborting at this stage for the fear of poverty or any other such reason is prohibited.

3.       The Stage of Alaqah / Mudghah (clot) (Second and third stage of forty days each): It is not permissible to abort a pregnancy when at this stage.  Unless there is a threat to mother’s life if the pregnancy continues then it can be done only if all other means of warding the danger has exhausted.

4.       After Four Months in Pregnancy: It is not permissible to abort the pregnancy at this stage.
All scholars of Islam conclude that at 120 days of pregnancy the ensoulment has taken place i.e. the soul has entered the body, it is forbidden to abort it only if it challenges the life of the mother, determined by a trusted physician.
Aborting a child when fully developed is haram and totally forbidden. This is considered as a murder In Islam and holds punishments of murder. The logic behind this is an agreed upon legal maxim in Islamic law: certainty should not be overridden by doubt. In other words, a potential life (that of the infant) should not threaten a stable life (that of the mother). Although both are technically alive, the survival of the mother takes precedence because her life is evidently established, while survival of the fetus within her is relatively more doubtful.
In the Islamic ethical system, life is sacred, and hence must be honored and promoted.Once the pregnancy takes place it is impermissible to terminate the pregnancy without the mutual consent of both the parents and without the legitimate reason. Once a fetus is 40 days old, abortions become impermissible according to most of the Islamic scholars unless the need is unavoidable and is justifiable under Islamic Law. Once the fetus reaches 120 days, all scholars agree that it is forbidden to terminate the pregnancy unless it is dangerous to mother’s life. Otherwise, it is unlawful feticide: the killing of a soul-bearing unborn human being. The scholars also deem abortion in the case of fetal demise permissible at any point, as the soul is no longer believed to be present.
Fataawa al-Lajnah al-Daa’imah, 21/434-438.
Al-Fataawa al-Jaami’ah, 3/1056