Honey, I got pregnant when I was 16. I was trying to figure our how to break up with him (just a kid...not much relationship experience) and bam! Pregnant! Yikes! But I was a good girl and did the right thing and married the guy. Even though I had a pretty good idea how it was going to turn out, I gave it my best shot.
The only regret I have about my life is that I ever told him I was pregnant. I should have just dumped him and moved on with my, and my new babys, life
Things might have been a little tougher financially (I will say that for the jerk, he paid his child support) but it wasn't worth it. The man has caused me more grief and tears over the years than I care to think about and I'm sure he'll continue to do so in the future.
A child ties you to a person until the day you die.
If you truly feel in your heart that this man has nothing to offer your child then don't bring him into the child's life just to say you did the "right thing".
Let your heart tell you what the right thing is.
If your child wants to meet him later, when he/she's old enough that you feel it's safe, then you can tell them who he is and where to start looking for him.
Good luck and congrat's. You are about to embark on the most incredible journey.