I have 2 kids from the same man.
#1 was planned
#2 was not.
When I told him about the pregnancy he left us. I will not go into details but he made sure I struggle, he left us homeless and I had to quit my job etc etc.
Thanks God he left us. I would have stick with him for the sake of having a family.
He was not interested on the pregnancy or our child.
I turned the bad experience into a positive one. I was 8 weeks pregnant.
I surrounded myself with good people. Started a course, learned how to knit, and still developing myself. I told myself I am not gonna grieve for a cunt. No thank you. He was probably out there chatting some girls whilst I was vomiting and having back pain, get off my face 
This is what I go by: If he is such a coward to leave you alone whilst pregnant, he was a waste of your time.
He is the coward and the looser- not you. Embrace and enjoy your pregnancy. Don'tbe afraid to tell your story, I found people compassionate and very empathetic towards me, never once was I looked down or ridiculized.
There's more of us out there than you would expect.
Do I need to say don't add him on the birth certificate? If you want to allow him contact by all means do so but legally you have all saying about your kid.