First of all, I would like to congratulate you on completion of your studies and may Allah allow you to marry a righteous woman who will help you excel in this world and Hereafter.
Here's the answer to your question:
Walimah is merely a Sunnah of the Holy Prophet Sallallahu Alaihe Wa Sallam. It is not obligatory to observe the ritual of Walimah upon anyone. If someone has the financial ability to afford the expense of Walimah then the feast should be arranged in a non-extravagant manner.
The word Walima refers to that feast which is observed at the time of wedding.
It is permissible to have Walima either before the first night of wedding or after. In either case, Walimah will stand valid.
However, the desirable time to have the feast of Walimah according to many scholars is after the first night of wedding but there is no harm at all if someone observes the feast of Walimah before first night of wedding especially if it is due to an excuse.
And Allah knows best.
Mufti Ikram ul Haq
Fatwa Center of America