Bismillah ArRahman ArRaheem
Wa-Alaykum As Salaam
May Allahﷻ forgive the believing men and women, for "Truly, God loves those who repent, and He loves those who cleanse themselves." (2:222).
As you are aware, adultery is considered a Greater Sin.
With regards to your questions:
*I want to know if there is a way I can seek for his forgiveness and ask his guidance so that I can control myself for future wrong doing?*
Please repent honestly and truthfully. You should spend some time thinking about how you should repent purposefully, read as much material as you can about repentance and how it can be achieved. See also http://www.askanalim.org/node/106
*What is islamic ruling in case a pregnancy is a result of this adultery.*
1. Abortion is not permissible. Ruling 2462. If a woman becomes pregnant as a result of fornication or adultery, it is not permissible for her to have an abortion. https://www.sistani.org/english/book/48/2352/
2. The child is illegitimate. Please see also http://www.askanalim.org/node/243
Insha-Allah you will be in our prayers.