Sorry it took me a while to respond... here it is. It is my firm belief that the ONLY reason that two people should EVER marry is because they love each other and want to share every new experience together. If this is not how you feel, then NO, you should not get marry just because you are going to have a child. If it does come to pass that a baby will be born, the two of you will always be apart of each others life. It is much better to do so amicably then with bitter feelings if you marry for the wrong reasons and separate.
When I told him I was pregnant, I told that if your part of this, then your there from the beginning or not at all. It was a all or nothing, and I had no problem being a single mother.
If a baby is coming your way, you will know what is best for the both of you. No matter what you decide be firm in that decision, don't let any one talk you into second guessing your self.

__________________

Twins: Boy: Alec Nathanael and a Girl: Avry Michelle