5 week pregnant PLEASE GIVE ADVICE.

I just found out I’m pregnant a few days ago and I wasn’t excited about it at all. When I told the dad he was very excited and wants to keep it. I already have a 3 yr old daughter who doesn’t have a father. I don’t want to go through that again. Almost everyone is against me having another except my sisters and my daddy they think I should go for it so I won’t regret in the long run. I’m really suck and don’t know what or how to feel. I want to keep the baby I just don’t know how I will be able to afford one.